That kind of heat is deceptive. If you're not acclimatize to dry heat it will take you down. When I was with the Marines in the Middle East during the summer, in the field fresh, troops were required to drink water/liquids until they were urinating every 20 minutes for a few days, until they adapted and learned about dry heat. When I was working at Ft. Irwin, which butts up to Death Valley, and a training center for deployment to Afgahnistan/Iraqi, the uniform of the day for some of the troops included a Camelback.