I came across a recipe for homemade Gatorade on the net. I'm not sure if it taste like Gatorade or cool-aid, but it was good. Anyways, here are the ingredients:
32 oz H2O
1/4 cup sugar
1/2 packet unsweetened cool-aid
1tsp. lemon juice
mix together and enjoy!
(It was also the recipe for pedialyte. So when needed, this is way cheaper and tastier than the real stuff!)