How to Make Caffeinated Sparkling Water at Home

It's 6am. The kettle isn't on. I don't want coffee. I want something cold, bubbly, caffeinated, and I don't want to drive to a gas station to find it.

So I pour a glass of sparkling water, add one squeeze of Drizz, stir it twice, and drink. Total time: fifteen seconds. Total caffeine: 65mg. Total cost: about $1.20.

This is a post about how to do that at home, two ways. The lazy way (store-bought sparkling water, add drops). The home-carbonator way (SodaStream or similar, with one rule you cannot break). I'll walk through both, cover the caffeine math, and share what I've learned after about two years of doing this almost every morning before I run.

Publisher disclosure: EnergyDrops.com is published by the team behind Drizz, which is included in this comparison.

The Direct Answer

To make caffeinated sparkling water at home, you need two things: sparkling water (store-bought or home-carbonated) and a caffeine source that mixes clean, like a liquid caffeine drop. The method is simple.

1. Pour cold sparkling water into a glass.
2. Add one squeeze of a caffeine drop (Drizz is 65mg per squeeze).
3. Stir gently with a spoon or straw to preserve carbonation.
4. Drink.

The one rule that matters for home carbonators like SodaStream: carbonate plain water only, then add caffeine drops to the glass after. Never add anything to the carbonating bottle before pressurizing. The SodaStream support site is explicit about this, and ignoring it will clog your machine and void the warranty.

That's the whole method. The rest of this post is the detail, the caffeine math, the brand picks, and the things I got wrong at the start.

Table of Contents

• Why caffeinated sparkling water is a category now
• Method 1: Store-bought sparkling water plus drops
• Method 2: SodaStream or home carbonator plus drops
• The caffeine math: how much is in each glass
• The best sparkling waters to use
• What I learned after two years of doing this
• Cost comparison vs cans and vs coffee

Why caffeinated sparkling water is a category now

Celsius hit $1.3 billion in revenue in 2023. Alani Nu, Ghost, Red Bull's sparkling line, Monster's sparkling line, Olipop and Poppi both testing caffeinated SKUs. Something is happening.

My read: people want the bubbles and the caffeine without the sugar bomb and without the artificial everything. The old energy drink category was 300 calories, 50g of sugar, and a flavor profile that only works if you're nineteen. The new category is zero sugar, 100 to 200mg of caffeine, light flavor or no flavor.

The problem is that the cans are expensive and the flavors are not for everyone. If you don't love tropical fruit splash or sour cherry, your options narrow fast. Making it at home solves both: you pick your water, you pick your caffeine level, you skip the flavor if you want.

Method 1: Store-bought sparkling water plus drops

This is the one I use most mornings.

What you need: one bottle or can of plain sparkling water (cold), one bottle of liquid caffeine drops, a glass, a spoon.

The steps:

1. Open the sparkling water and pour it slowly down the side of a glass. Pouring down the side preserves more carbonation than pouring straight down the middle. Small difference, but you'll notice over time.
2. Add one squeeze of Drizz. One squeeze is 65mg of green tea caffeine, plus L-theanine and taurine.
3. Stir once or twice with a spoon. Don't go hard. Carbonation leaves fast if you agitate it.
4. Drink within about ten minutes before the bubbles start to flatten.

A touch of sucralose balances caffeine's natural bitterness without adding sugar. In plain sparkling water you may notice a slight sweetness, which is honest. If you want zero sweetness, you can get there with other methods, but you lose the clean, no-crash profile that the drop format delivers.

If you want more caffeine, add a second squeeze for 130mg total. Still under the caffeine load of a large coffee. The FDA guidance on caffeine puts 400mg per day as a safe ceiling for most healthy adults.

Method 2: SodaStream or home carbonator plus drops

If you drink sparkling water every day, a home carbonator pays for itself in a few months. I use a SodaStream Terra. There are other machines (Aarke, Drinkmate, Phillips GoZero) and the rule I'm about to give applies to all of them.

Carbonate the water first. Add caffeine drops to the glass after. Never put anything other than plain water in the carbonating bottle.

Here's why. Those machines pressurize water with CO2 by injecting gas through a small nozzle at the top of the bottle. If you add anything besides water, two things can happen. First, the nozzle clogs, and now your $100 machine is a paperweight. Second, additives can cause foaming during pressurization, which pushes liquid up into the machine's internal mechanism and voids the warranty.

SodaStream's own instructions say to add flavors and additives only after carbonation. Drinkmate is the one exception in the category because its design can handle non-water liquids, but even they recommend starting with plain water for consistent carbonation.

My routine:

1. Fill the carbonating bottle with cold, filtered water to the fill line.
2. Carbonate per the machine's instructions. I do three presses for a solid medium-bubble water.
3. Pour the carbonated water into a tall glass.
4. Add one squeeze of Drizz.
5. Stir gently and drink.

The whole thing takes about forty-five seconds including cleanup.

The caffeine math: how much is in each glass

One squeeze of Drizz is 65mg of green tea caffeine. For reference, from the Mayo Clinic's caffeine chart:

• Brewed coffee, 8oz: 95mg average
• Red Bull, 8.4oz can: 80mg
• Celsius, 12oz can: 200mg
• Espresso shot, 1oz: 63mg
• Green tea, 8oz: 28 to 38mg
• Black tea, 8oz: 47 to 55mg

So one squeeze lands at roughly the caffeine of a single espresso shot. Two squeezes is close to a strong cup of coffee. Three squeezes is Celsius territory.

The green tea caffeine piece matters here. Research from a 2008 study published in Nutrition Reviews looked at the combined effect of caffeine and L-theanine, both naturally present in green tea, on attention and alertness. The combination produced a different subjective experience than caffeine alone, with participants reporting less of the jittery edge. I'm not making a health claim here. I'm telling you what the research shows and why I built the formula this way.

If you've never had a liquid caffeine drop before, start with one squeeze. See how it feels. Adjust from there.

The best sparkling waters to use

I've tested a lot of these. My short list, by use case:

For plain, clean sparkling water that lets the drops do their job:

• Topo Chico (Mexican mineral water, strong bubbles, slightly mineral finish)
• Perrier (fine bubbles, light minerality)
• SodaStream plain (whatever filtered water you load it with, infinitely customizable)
• Mountain Valley Sparkling (clean, limestone-filtered, strong carbonation)

For flavored sparkling water, where you want a little something going on:

• LaCroix (light flavor, won't fight the drops)
• Spindrift (real fruit juice, more pronounced flavor, works well)
• Waterloo (middle of the road, clean execution)

Avoid:

• Anything with added sweeteners already (Bubly Bounce caffeinated, Spindrift Spiked). You'll stack sweeteners.
• Flavored waters with strong citrus if you're sensitive to combined flavors. Some lime sparklers plus caffeine drops get a weird edge.

Prices checked October 2026: a 12-pack of LaCroix runs about $5 to $6. Topo Chico 12-pack runs $10 to $12. SodaStream CO2 refills run about $15 to $20 and make around 60 liters of sparkling water, which breaks down to roughly $0.25 per liter plus the water cost.

What I learned after two years of doing this

Three things I got wrong at the start.

One: I used to stir too aggressively. The bubbles are the point. Half the pleasure of sparkling water is the carbonation on your tongue. Stir two gentle times, max. If you need to mix more, use a straw and give it one swirl.

Two: I used to add the drops to hot water first thinking it would mix better. It doesn't. The drops disperse fine in cold sparkling water. And heat changes nothing about dispersion, it just kills your cold drink. Skip the step.

Three: I used to use flavored sparkling water as a default. Then I realized the flavored waters were adding a dimension I didn't need in the morning. Plain sparkling water plus a squeeze of Drizz is a cleaner starting point. Save the flavored stuff for the afternoon when you want a little something.

One more thing. If you're drinking this before a workout, give it fifteen to twenty minutes to absorb. Caffeine on a sparkling water base hits reasonably fast but it's not instant. For my long runs, I squeeze it into cold water (not sparkling, because bubbles and running don't mix) about twenty minutes before I head out the door. For morning desk work or a kitchen table session, sparkling is better.

I write about this stuff a lot because this is actually how I drink Drizz. The founder of the company does, in fact, use the product. The full breakdown of why I built it as a drop format and not a can is on the energy drops hub. And if you want more on how to add caffeine to any drink without changing the flavor profile, I wrote the full guide at How to Add Caffeine to Any Drink Without Changing Taste.

Cost comparison vs cans and vs coffee

Let's do the math on a daily sparkling caffeinated drink, five days a week.

Celsius or similar canned energy drink: $2.50 average per can x 5 days x 52 weeks = $650 per year.

Drive-through coffee: $4.50 average per medium x 5 days x 52 weeks = $1,170 per year.

Store-bought sparkling water plus Drizz:

• Sparkling water: $0.50 per can/serving x 5 x 52 = $130
• Drizz: $14.99 for 15 squeezes, 5 squeezes per week, so about 17 bottles per year = $255
• Total: $385 per year

SodaStream plus Drizz:

• SodaStream Terra: $100 one-time
• CO2 refills: 4 per year at $17.50 = $70
• Water: filtered tap water, negligible
• Drizz: $255 per year
• Total year one: $425. Total year two: $325.

So you save between $225 and $845 per year depending on what you're replacing, and you get to control the caffeine level, the water quality, and the flavor profile.

That math is why I think caffeinated sparkling water at home is going to be a bigger category than people realize. The cans are a convenience tax. Once you have the kit at home, you don't go back.

Pick up a bottle of Drizz, grab your favorite sparkling water, and try it tomorrow morning. One squeeze. One glass. Fifteen seconds. See what you think.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your doctor before starting any new supplement, especially if you are pregnant, nursing, or have a medical condition.