Alcohol is basically a thirsty thief that steals water from your body. Every drink you take? Chase it with a full glass of water. No, really—make it a game. For every sip of booze, you take a sip of H2O. Your kidneys will thank you, and your head will stay clearer.
Pro tip: Alternate drinks—one alcoholic, one water. This keeps your hydration level from dropping into the danger zone. If you wake up with zero nausea tomorrow, you’ll look back at this advice and nod like a wise old owl.