The ONLY thing that works is ice cold water. I try to slam at least 8 ounces every 20 minutes and get off the roof by 1:00. That kind of heat is normal for a North Texas summer.
Water eh?
The past two summers Ive formed a habit of eating an orange and/or strawberries every day on first break. Or other berries and citrus fruits. And I pound the water, with some tea at lunch. The caffeine can't be good for the heat situation but I need a kick to stay in high gear. I've also been eating more raw veggies this year which sits well on my stomach when too hot to eat other things.