[Ryanamur]

Since "hangover" is caused by dehydratation, the solution actually work it's best when taken before you go to be:

Take one 8oz glass of water for each ounce of Alcohol you drank.

So, if you drank 25oz of Rum, you drink 25 glasses of water

1 beer = 1 oz of hard stuff
1 glass or wine or spirit = 1 oz of hard stuff.

Also, depending on what you drink the night before, you might want to be carefull as to what you drink the next morning.

If you had mixes with O.J. stay away from O.J.
Rum and Cokes... stay away from coke...

The only exception: Beer, you can have another one in the morning, it helps.