I live in Texas... and I have been riding in weather 100 and below on ride of 20 to 60 miles.
Here is what I do:
1) Ice Cold water in my Camelbak.
2) 1, 24oz Polar bottle with water (frozen overnight).
3) 1, 20oz Polar bottle with Gatoraid (diluted, and frozen overnight).
4) Peanut butter crackers to snack on.
5) A clif bar to snack on.
6) Shot blocks in a bag on my bike, I eat one of those every 15-30 minutes.
And when I did my 60 mile ride and it was really hot and my calf started to act twitchy... I went and ate some straight salt. Gross, yes. But I never cramped up.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"