Not So Fast, Bartender
Go ahead and pour yourself a drink — you're going to need it when you see the hidden animal byproducts that can find their way into your favorite alcoholic drinks either as direct ingredients or through the filtration process. This includes things like honey, isinglass from fish bladder membranes, casein from milk and gelatin derived from animal connective tissue (nobody's putting that info on a cocktail menu). The good news is that once you know what to look for, the workarounds are pretty simple.
The Spirits Situation
Most distilled spirits start out vegan-friendly at the source, but whiskey can be a bit of a wildcard (like Aunt Linda on her third whiskey sour), depending on the casks used. Some cask finishes like sherry or port may involve
animal-derived additives, though many producers now avoid those entirely. Where things get murkier is with wine, some beers and anything with added cream, honey or flavoring. Agave nectar, maple syrup or coconut nectar can all step in for honey, and various plant-based milks like almond, coconut or soy work just as well in creamy cocktails.
When in doubt, head on over to a site like Barnivore, a community-run vegan alcohol directory where each entry is checked and often double or triple-verified. You can search for any brand before you shop. Easy-peasy. Think of it as the world's most useful rabbit hole.
The Foamy Stuff
Classic sours and fizzes get their silky, frothy tops from egg whites, which is where a lot of home bartenders hit a wall wall when trying to veganize their cocktails. Enter aquafaba. It sounds like something only the super elite can get their hands on but it’s actually … the brine left over from a can of chickpeas. While the smell might seem like a big fat no at first, it evaporates during the shaking process and the chickpea taste neutralizes in the mix. The result is the same gorgeous foam you'd get from egg whites.
Any cocktail that calls for egg whites can be made with aquafaba. Use 2 tablespoons of aquafaba per egg white called for in a recipe. Give it a dry shake first (no ice) to build the foam, then add ice and shake again to chill the drink and voilà! Pour, strain and stand back to admire your handiwork.
The Swap Cheat Sheet
The whole cheat sheet fits on a cocktail napkin: aquafaba for egg whites, agave or maple syrup for honey, plant-based milk for dairy cream and a quick Barnivore check to be on the safe side. No specialty store, no bartending course and no (gasp!) giving up your cocktails — just a can of chickpeas and a solid shake. Back in the '90s, we were impressed by a wine cooler in a can. Look how far we've come.