Drinkmate OmniFizz — Carbonate Any Beverage
Unlike standard SodaStream machines, the Drinkmate OmniFizz is designed to safely carbonate any liquid — juice, wine, cocktails, cold brew — not just water. Uses standard 60L CO₂ cylinders and third-party refills.
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Why Carbonate Cocktails?
Carbonation does something to a cocktail that stirring or shaking cannot replicate. It changes the perception of sweetness — CO₂ partially suppresses sweet notes and sharpens bitter and acidic ones, which means a Campari-based cocktail becomes more bracingly refreshing, and a sweetened citrus drink becomes crisper and more alive. Carbonation also changes how aroma compounds reach the nose: the bubbles carry volatile botanicals and citrus oils to the surface, which is why a carbonated gin drink smells more strongly of the gin's botanicals than a stirred version does.
The practical benefit is consistency. A batch-carbonated Aperol Spritz poured from a keg has identical carbonation from the first glass to the last. A poured version varies — more fizzy when the prosecco is fresh, noticeably flat by the third round. For entertaining eight or ten people, there is no comparison. You make the batch, set the pressure, and pour. No shaking, no topping up, no guests watching you wrestle with a half-flat bottle of prosecco.
Carbonation also extends cocktail shelf life. A batch-kegged drink stored under CO₂ pressure stays fresh for 2–4 weeks. A pitcher of mixed cocktail oxidizes and turns bitter within 24 hours.
Method 1: Carbonation Cap on PET Bottle (Best for Single Batches)
A CGA-320 carbonation cap threads onto any standard PET bottle neck and connects to a CO₂ line, allowing direct injection into any liquid — not just water. A full kit runs $15–$25 and works with any CO₂ source, including a SodaStream cylinder via a short adapter hose. This is the lowest-commitment entry point for cocktail carbonation.
- Mix your cocktail without ice. Cold is essential — chill to 38°F before carbonating. Ice dilutes and creates nucleation sites that cause premature CO₂ release during pressurization.
- Fill a 1L PET bottle to 80%. Leave headspace. Squeeze the bottle to remove as much air as possible before capping — residual oxygen competes with CO₂ and oxidizes citrus-forward drinks quickly.
- Purge oxygen from the headspace before full pressurization: connect CO₂, pressurize to 5 PSI briefly, release via the cap, repeat twice. This displaces most of the oxygen with CO₂.
- Pressurize to 35–40 PSI and shake for 60–90 seconds. You will feel resistance increase as CO₂ absorbs. When pressure holds relatively steady instead of dropping, absorption is mostly complete.
- Refrigerate 20–30 minutes before opening. Carbonation needs to stabilize. Opening immediately while warm forces rapid CO₂ loss before it has fully dissolved into the liquid.
- Serve over ice, pouring gently down the glass side.
Method 2: Cornelius Keg (Best for Batches of 8+ Servings)
The 2.5-gallon or 5-gallon Cornelius keg is the standard for serious batch cocktail carbonation. The carbonation is more even than the shake method, and dispensing via tap means you never handle the batch again after filling. For party hosting, the keg is objectively superior.
- Sanitize the keg with a no-rinse sanitizer. Residue from a previous batch affects flavor noticeably in cocktails, which are less forgiving than beer.
- Purge oxygen thoroughly — connect CO₂, pressurize to 2 PSI, pull the pressure relief valve, repeat four times. Oxygen inside the keg oxidizes the cocktail during carbonation.
- Fill with pre-chilled cocktail. Leave ~15% headspace. Do not fill cold from the refrigerator only to let it warm up while you connect equipment — work quickly.
- Burst carbonate: 30 PSI for 24 hours undisturbed at refrigerator temperature. Cocktails carbonate faster than beer because lower residual sugar allows better CO₂ dissolution. After 24 hours, reduce to serving pressure (typically 10–15 PSI for most cocktail styles).
- Sample after 24 hours via a short test pour. At proper carbonation the pour should sustain fine bubbles and a brief head. Under-carbonated: add 12 hours at full pressure. Over-carbonated: vent via the relief valve and allow to settle.
Method 3: iSi Whipper with CO₂ Charger
iSi cream whippers accept both N₂O (for whipped cream) and CO₂ chargers. CO₂ chargers carbonate rather than aerate — the result is a lightly sparkling cocktail portion, not foam. This method works for 1–2 servings where you want a quick sparkling cocktail without setting up a full CO₂ system. Carbonation level is lower and less controllable than the keg or cap methods — expect approximately 1.5–2.0 volumes, equivalent to lightly sparkling mineral water. Charge once, swirl gently (do not shake), charge a second time, refrigerate 5 minutes, then dispense.
Which Spirits and Ingredients Carbonate Well
CO₂ is chemically inert with most spirits. It does not react with ethanol, is not absorbed by proteins or fats at standard concentrations, and does not affect alcohol content. What matters is what else is in the cocktail.
| Ingredient | Carbonates Well? | Notes |
|---|---|---|
| Vodka, gin, tequila blanco | ✅ Excellent | Neutral spirit, lets carbonation and aromatics dominate |
| Light rum | ✅ Excellent | Ideal for mojito, tropical, and daiquiri styles |
| Aperol, Campari, Lillet, vermouth | ✅ Excellent | Bitterness sharpens pleasantly under carbonation |
| Bourbon, aged whisky, dark rum | ⚠️ Good | Complex esters can shift subtly; use lighter expressions |
| Fresh citrus juice | ✅ Good | Fine to carbonate; use same-day juice for best results |
| Simple syrup, honey, agave | ✅ Fine | No issues; adjust sweetness before carbonating |
| Egg white or aquafaba | ❌ No | Foams catastrophically under pressure — do not carbonate |
| Cream or full-fat dairy | ❌ No | Fat breaks under CO₂; separation is immediate |
| Fruit purées with pulp | ⚠️ Careful | Clogs keg dispensing lines; strain extremely well first |
PSI Targets by Cocktail Style
Most carbonated cocktails land between 2.0 and 3.5 volumes CO₂ — lighter than commercial soda, in the range of good sparkling wine. Heavier, sweeter cocktails can handle higher carbonation; delicate aperitivo-style drinks work better at the lower end.
| Cocktail Style | CO₂ Volumes | PSI at 38°F | Character |
|---|---|---|---|
| Light spritz (Aperol, Hugo, Lillet) | 2.5–3.0 | 12–16 PSI | Delicate, wine-like bubble |
| Highball (G&T, Mule, Collins, Fizz) | 3.0–3.5 | 16–20 PSI | Lively, refreshing, assertive |
| Citrus sour (Daiquiri, Gimlet) | 2.5–3.0 | 12–16 PSI | Bright, sharp without egg white |
| Bitter aperitivo (Negroni Sbagliato-style) | 3.0–3.5 | 16–20 PSI | Crisp, bracingly bitter |
| Tropical / tiki | 3.5–4.0 | 20–24 PSI | Vibrant, fruit-forward |
Use the Carbonation Calculator for exact PSI at your specific temperature.
Three Proven Batch Recipes
Batch Aperol Spritz — 8 servings (~1L)
Combine 300ml Aperol, 500ml dry prosecco-style wine, and 200ml cold water. Cold crash to 38°F. Force carbonate at 12 PSI using set-and-forget for 12 hours, or shake method for 1 hour. Serve over ice with an orange wheel. Unlike a poured Spritz where the prosecco goes flat after opening, this batch holds perfect carbonation from glass one to glass eight — the defining advantage of batch carbonation.
Carbonated Tom Collins — 6 servings (~750ml)
Combine 240ml London dry gin, 120ml fresh lemon juice (double-strained), 90ml simple syrup, and 300ml cold water. Taste — it should be tart and slightly under-sweet because carbonation reduces perceived sweetness. Cold crash, carbonate at 18 PSI via shake method for 90 seconds, refrigerate 30 minutes. Serve over ice with a lemon slice. The carbonation integrated through the drink rather than added on top creates a noticeably different texture than a shaken Collins topped with soda water.
Batch Moscow Mule — 10 servings (~1.2L)
Combine 400ml vodka, 800ml strong ginger syrup diluted to ginger beer intensity (1:4 with water), and 180ml fresh lime juice. Adjust lime-to-sweet balance before carbonating. Cold crash to 38°F. Burst carbonate at 20 PSI for 24 hours, then reduce to serving pressure. Serve in chilled copper mugs. The homemade ginger base delivers noticeably more ginger character than any commercial ginger beer alternative.
Common Mistakes and Fixes
- Cocktail goes flat minutes after pouring: Temperature was too warm, or high sugar content is competing with CO₂ dissolution. Chill further and carbonate at slightly higher PSI next time.
- Explosive foam when opening the tap: Over-carbonated or keg is warm. Release pressure via the relief valve in short bursts, re-chill, and wait 2 hours before serving again.
- Off-flavor in kegged cocktail: Keg not properly purged of oxygen, or residual sanitizer. Purge more thoroughly with CO₂ and rinse with sanitizer then water before filling.
- Citrus tastes dull or flat-tasting even with good carbonation: Juice was more than 24 hours old or was bottled. Same-day fresh juice and a small addition of citric acid solve this consistently.
- Inconsistent carbonation glass to glass from keg: Temperature variation inside the keg, or keg was shaken during serving. Keep the keg stationary and at steady refrigerator temperature throughout service.