On very hot and humid days, I put a frozen 16 ounce bottle of water in the bottom of my camelbak and another bottle on top. In the middle is the bladder, filled with water that has been in my fridge overnight. Sometimes I’ll even throw in a tray of ice cubes into the bladder. Then I go riding with ice cold water, and for me, that helps keep me cool. What do you do to cope with the heat?