There’s no such thing as a hangover cure, only prevention. So I came up with the Three Cup Challenge: When you get home after a big night out, chug three cups of water before bed. It’s unpleasant but it works, if you commit; my girlfriend sometimes stops at two and it doesn’t hit right. There’s also the minor inconvenience that you will wake up at 5 AM needing to pee in a truly psychedelic way. Worth it, though.