Drink beer: it hydrates.
Actually beer will dehydrate a person. The alcohol tends to cause a diuresis with the kidneys removing proportionally more water from the body than alcohol. Thus, after a drinking bindge people are very thirsty, after they stop throwing up the next morning, curled up like a fox around the porcelin commode, calling dinosaurs as they puke their guts out. That is what I have read about such a condition.