You might not be facing a hangover if you'd paid more attention to your best friend, water, the night before and alternated a glass of H20 in between every alcoholic beverage. But you didn't and now you're in massive, stomach-writhing, head-pounding pain. Alcohol dehydrates your body of fluids, so the more water you drink, the more fluids you replace and the better you will feel. While nursing a bottle of water the next morning will certainly help your hangover, this method is best used preventatively. Down a tall glass of water (or several) before falling asleep and wake up feeling at least a bit better.