3. Water
Image Source: Abdulla Al Muhairi
H2O is a must. As you likely know from the frequent trips to the bathroom during a night of debauchery, alcohol is a diuretic and can cause dehydration. Dehydration is one of the causes of a hangover, so be sure to drink plenty throughout the day. Water is one of the best hangover cures going, but try not to drink it too fast, otherwise you may feel sick.