Make your own sports drink

After paying about $2.50 for Gatoraid at the supermarket, I got the clever idea that someone had probably come up with a recipe for sports drinks you can make at home. These two I found look the most practical of several sites I researched:

http://www.dissidents.com/articles/sportsdrink.htm

http://www.thriftyfun.com/tf641006.tip.html

Let me know how it goes.