My wife and I did 20 miles at bad water in death valley in july before the sun came out. It was 100 deg F before the sun came out. I sucked through 150 oz of water but the ride the short enough to not have problems. There was very little sweat on our skin or clothes since it evaporates quickly. We have lived in the southwest in the past and in Alabama (100 deg with 90 % humidity), so we were prepared for the heat. I would definitely recommend riding in the heat before you plan this activity. I would recommend the support vehicle have plenty of extra and electroyltes. Water and food can be had at scottys castle, furnance creek, and Stove pipewells.