We use a recipe from Nancy clark's book...let me see if I can remember it, hubs usually makes it for us...

1/2 Cup orange juice
1/4 C lemon juice
1/2 C sugar
1 tsp sea salt

Heat the oj and about 1 cup of water in the micro and dissolve the sugar and salt in it. Add lemon juice and then add the whole mixture to a quart container and fill it with water.

I like it much better than pre-made electrolyte drinks. sometimes i cut it with a little bit extra water.

btw, hubs said he would have no problems with the suggestions to eat more and he said that if he had asked this question on the bike forum they would have just said that he was too fat for cycling. He is not, but he certainly doesn't have the stereo typical cycling frame...more of a baseball player frame.