How do you ladies do it when it's a 100+ degrees outside, for those who live in AZ? I did 5 miles yesterday, and felt pretty good afterwards. I also work out at the gym... Will this help? How do you know how much water you need? I can suck up to 2 liters in less than an hour, which I am sure isn't good??? I also take a bottle with ice in it to spray myself down.

