For me - the strongest available coffee from vending machines at the uni. Or something self made in home. Depending on proportions between coffee, sugar, water, milk, and RAW POWER I call them: For Kids < [classy lady] < Dark Whore <<< Triforce (I'm a little afraid of drinking that one, it's like one of those evil forces that give you power at the cost of your life).
Cold tea is good too.