For Sprints since you are not on the bike very long (less than an hour, usually) you may not need to take a water at all. That depends on how hot it is and how much you sweat. Take a hit in transition, maybe with some gel, and then again after the bike. There are usually a couple of aid stations on the road if you feel dehydrated, but your body can go without water for this time period. If you do take a camelback, take a small one and don't fill it more than 20 ounces or so. In the meantime, practice, practice, practice (this includes putting a bottle in and taking it out of a cage). Good luck and have fun.

BT