Hosting twenty people at home and trying to build twenty cocktails one at a time is the host's nightmare. You spend the whole night behind the makeshift bar instead of with your friends. The bartender's solution is to pre-batch the drinks, with one or two finishing steps left for service. Here is how to do it properly.
The math
A single shaken cocktail is roughly: 60ml spirit, 22ml citrus, 22ml syrup, 22ml water from ice dilution. Final volume: 126ml plus ice in the glass.
For 20 drinks worth: multiply everything except the ice dilution by 20. The ice you will add at service.
1.2L spirit. 440ml citrus juice. 440ml syrup. That is a 2.1L batch before water and before serving ice. You will end up with about 2.5L of finished cocktail once water is added (more on water below).
What to batch and what to leave
The rule: batch everything that does not change over time. Add at service everything that does.
Batch in advance:
- Spirits.
- Syrups (simple, honey, gula melaka, flavoured).
- Liqueurs (Cointreau, Campari, vermouth).
- Bitters.
- Water (calculated dilution; see below).
Add at service:
- Citrus juice (loses brightness after 6 to 8 hours, even refrigerated).
- Egg white or aquafaba (needs to be shaken to foam; cannot be batched).
- Soda water or sparkling top (loses carbonation as soon as it touches still liquid).
- Anything fresh that wilts (mint leaves, garnishes).
There is a middle ground: citrus juice can be batched up to 4 hours ahead if you are batching for the same day. Beyond that the brightness fades and the drink reads dull.
The water question
A shaken cocktail picks up about 25 to 30% of its final volume in water from melting ice during the shake. If you batch without water, then shake each portion with ice at service, you will get the right dilution. If you batch with water built in, you can serve over rocks without shaking, and the dilution is correct.
For most home parties, we recommend the pre-diluted approach. You can pre-batch your drink with the right water already in it, refrigerate the whole batch, and just pour over ice when guests arrive. This is much faster than shake-on-demand and the drinks are nearly as good.
To pre-dilute: add water equal to 25% of your total batch volume. So a 2L batch becomes a 2.5L batch with 500ml water added.
The Negroni: easiest batch in the world
If you have never batched a cocktail before, start here. Negroni is equal parts gin, Campari, sweet vermouth. No citrus, no fresh juice, no carbonation. Almost everything can be pre-batched and refrigerated for weeks.
For 20 Negronis: 600ml gin, 600ml Campari, 600ml sweet vermouth, 450ml water. Mix in a 2.5L pitcher. Refrigerate. At service, pour 150ml over one large ice cube in a rocks glass, express an orange peel, drop it in.
This works because there is no citrus, no carbonation, nothing perishable. The batch keeps in the fridge for at least two weeks. Some bars age their Negroni batches deliberately; the flavours integrate and round out over a few days.
The Daiquiri (or any sour): trickier
Lime juice loses its brightness quickly. For a Daiquiri batch, our suggested approach: batch the rum, sugar, and water in advance. Make the lime juice fresh in the hour before the party. Add the lime to the rum-sugar-water mix at the last minute. Pour over ice.
For 20 Daiquiris: 1.2L white rum, 600ml simple syrup, 350ml water. Refrigerate this in advance. Fresh-squeeze 450ml lime juice on the day; add it to the chilled rum mix just before serving. Pour 110ml per glass over ice in a coupe.
The drinks that DO NOT batch
Some cocktails simply cannot be batched well. A few to avoid:
- Anything with egg white or foam. Whipping happens at the shake; cannot be done in batch.
- Anything with sparkling wine or soda as a major component. The bubbles go flat in batch. Build per-glass with a small portion pre-batched.
- Cream-based drinks at room temperature. The cream separates within an hour.
- Tropical drinks with crushed ice texture. The ice does not work in batch.
The "build-your-own" alternative
For really informal parties, an alternative to batching is the build-your-own bar setup. Lay out 2 or 3 spirits, 2 or 3 citruses, 2 or 3 syrups, a bowl of ice, and a sheet with three simple recipes printed on it. Guests serve themselves. This works for casual gatherings of 10 to 30; it does not work for cocktail-precision events but is much less labour for the host.
Hosting math: how much per person
The numbers we use for planning:
- 2 drinks per person for a 2-hour event.
- 3 drinks per person for a 3 to 4 hour evening event.
- 4 drinks per person for a multi-hour party that includes dinner.
Always batch slightly more than you think; running out is much worse than having leftovers (which you can refrigerate and finish at home over the next week).
The glass and ice question for parties
You will not have 20 matching rocks glasses. That is fine. Buy or rent generic 250ml glasses; do not stress about cocktail-specific glassware for home parties.
Ice: this is the harder problem. Home freezers do not produce party-volume ice. Order a 5kg bag from a grocery store the morning of the party; supplement with whatever your freezer made the night before. For 20 people drinking three each, you need at least 5kg.
One small note
If batching cocktails for a party feels like too much, do this instead: book a private event with us. We can host groups of up to about 20 at either room (depending on the night). Pre-set menu, full bar service, no equipment to wash. Sometimes hiring it out is the move.
Either way, batching is one of the most useful skills a home host can learn. The first time you make 20 Negronis in advance and pour them effortlessly through a four-hour party, you will not go back to building one at a time.
Frequently asked questions
What is batching a cocktail?
Batching means pre-mixing the non-perishable parts of a cocktail (spirits, syrups, liqueurs, bitters, and the calculated dilution water) in advance, often by 20 times or more, so you can serve quickly during a party. At service you add only the parts that do not keep: citrus, egg white, soda, fresh garnish. Standard bartender practice for high-volume events.
How do I scale a single cocktail recipe to 20 servings?
Multiply every shelf-stable ingredient by 20, then add water equal to roughly 25 percent of total batch volume to simulate the dilution a shake would normally add. A 2L batch becomes 2.5L with 500ml water. Refrigerate. At service, pour 125 to 150ml per glass over ice. For sours, hold the citrus and stir it in only on the day of the party.
Which cocktails batch best?
Stirred drinks with no citrus are easiest: Negroni, Manhattan, Boulevardier, Martini all batch beautifully and improve over a few days as the flavours integrate. Drinks with fresh citrus (Daiquiri, Margarita) batch in two parts: the spirit-syrup-water portion in advance, the citrus added at service. Drinks with egg white, soda top, or crushed ice do not batch well.
Can I substitute bottled lime juice for fresh when batching?
For a serious cocktail batch, no. Bottled lime is preserved and tastes flat and slightly chemical. The better workaround is acid-adjusted super juice (lime peels, citric and malic acid, water) which keeps the bright character while extending shelf life. For very casual punches where you also have spirits, syrup, and fruit doing the work, bottled lime is forgivable but not preferred.
Where can I host a party in PJ without batching myself?
Both Dissolved Solids (43-1 Jalan SS20/11, Damansara Kim, WhatsApp +60 11-4008 7607) and Soluble Solids (50-1 Jalan SS2/24, WhatsApp +60 11-1682 8651) host private events of up to roughly 20 people depending on the night. Pre-set menu, full bar service, no equipment to wash. WhatsApp ahead with the date, headcount, and any specific drinks you want.