Run for cover in air-conditioned stores I guess. I'm lucky enough to have a pool in my backyard, air conditioning, fans, and drinkable tap water. I absolutely can't stand heat and was probably the only person in Canada this year who didn't mind the snow and cold at all. I find just staying indoors helps. Taking brief showers regularly is a good idea too. Other than that, god help us when the ozone layer collapses.