eat something before, during and also in the morning after, drink water between the alcohol drinks, dont mix a lot of types of alcohol, it is best for you to choose one drink and keep drinking the same shit all night, dont drink very cheep drinks- they have a lot of anti-freeze inside -that what usually the cous to a hangover. 

Dont drink coffee, caffeine makes your hangover worse also other hot drinks is not recommended. your body is dry, dont go out to the sun and drink drinks that will make you go a lot to the ladies/guys room...

eat breakfast, a toast can be good or any thing els salty, drink water, bannana does a very good job as well as some other fruits, and stay away from light...

if you dont want to get drunk at all drink some olive oil before you leave home.