One of a series of "elemental" drinks with names like Rain, Fire, Earth, Gravity, etc., put out by Snapple. For some reason very few grocery stores seem to have them, but they're relatively common at gas stations and drugstores. Check around. The elementals are designed to use natural ingredients to produce a certain effect on your body. Despite the fact they are made by a large, faceless corporation, the herbology is actually very legitimate, and they really do do what they claim.

My favorites are Rain ("refresh") and Fire ("energy"). Fire is great for a quick buzz, but Rain is much better and basically puts you into literally the perfect mood for coding. Who needs caffeine when you have ginseng?

Be sure to shake the bottle before drinking-- it tastes a lot better if you do.