Hydrate, hydrate, and hydrate some more. (And then maybe take an aspirin.)
Take a seat at any good cocktail bar, and the first thing they'll set in front of you is a glass of water. It's not just hospitality—it's necessary. Even though science hasn't pinpointed dehydration as the only cause of your hangover, there's no denying that alcohol is a diuretic. Meaning: It makes you pee, so replenishing fluids throughout your night is key for avoiding any Saharan morning-mouth situations. Beyond that, bar-industry pros say it's a good idea to cap off your bedtime routine with another pint of water as well as an aspirin or Ibuprofen for good measure. Which makes sense: Since hangovers may be a reaction to the body's inflammatory response, an anti-inflammatory could go a long way toward staving off—or at least lessening the effects of—that hangover.