I noticed an article in an exercise magazine that mentioned homemade sport drink that works as well or better than any commercial drink.The exercise physiologist, Stacy T. Sims, created the formula.http://prevention.stanford.edu/profiles/Stacy_Sims
2 packs of Emergen-C
1/2 pack Kool-Aid (no sugar) for flavor
She and another researcher were consultants to Team Radio Shack on the Tour de France.
If you wish to read some science on hydration and exercise:http://www.active.com/cycling/Articles/Cutting-Edge-Hydration-Strategies.htm?page=2
Article contributed by Bill, RNA and husband of a fellow RBS'er...as always, these are merely opinions and anecdotes and you should always consult with a health professional before beginning an exercise and/or diet regiment.