The secret to stress-free entertaining is simple: pre-batch your cocktails. Professional bartenders use a reliable ratio—for every drink you expect to serve, multiply all liquid ingredients by your guest count, then add 15% extra for waste and generous pours. Keep everything in the fridge in glass pitchers until service begins. The Batching Formula Take a classic Margarita: 2 oz tequila, 1 oz Cointreau, 0.75 oz fresh lime juice per drink. For 12 guests, multiply by 12, then add 15%: you need 27.6 oz tequila, 13.8 oz Cointreau, 10.35 oz lime juice. Combine in a pitcher, refrigerate up to 4 hours ahead, then serve over ice in glasses rimmed with salt. The trick is avoiding drinks with egg whites or cream—they break down during storage. Citrus-forward cocktails like Margaritas, Daiquiris, and Sidecars are ideal. Negronis and Manhattans work beautifully batched too. Stir batched cocktails thoroughly before serving; spirit density varies, and everything needs integration. Your guests arrive to happy hour already in progress, and you're actually enjoying your own party for once.