Extreme Heat Do's and Don'ts Do's Drink a lot of fluids, even if you aren't thirsty Wear sunscreen with an SPF 15 or higher Avoid caffeine, alcohol, or sugared sodas because they can make fluid leave your body faster Stay indoors if at all possible Wear light-colored, loose clothing Stay in the shade Try to limit outdoor activity to when it's coolest, like in the morning or evening hours Give pets plenty of water or bring them inside Don'ts Drink ice-cold drinks; they can cause stomach cramping Leave any living being in a closed car Skimp on water. If you are outside a lot in even 90 degree weather, you can lose a half gallon of water in 10 minutes