What's in your camelbak?

The one and only time i ever participated in a foot race (it was a 10k), i was about 18 years old. Near the finish line, the organizers had set up barrels and barrels filled with ice-cold cans (the 8 oz. size) of Budweiser. As the legal drinking age at the time was 18, I swigged a couple cans of Bud--ahhh. Quite refreshing, if not actually hydrating.