Another thought regarding electrolytes is to use something like Elete in your water bottles. It is just electrolyte salts, no sugars, no artifical sweetners. When you're not working it tastes salty; when you're working hard you won't notice the salts.

I used to use the Clif drink--I liked it and my stomach tolerated it, but my dentist wasn't happy with the idea of sipping on sugar-water for 6 hour rides. Postings here talked about separating out fluid from carbs. This is new for me this year, but it is working--I can control the foods that I can tolerate and the electrolytes in the Elete keep the leg cramps at bay.