That would depend upon the ambient temperature and humidity as well as your health and activity level. I live in the Chihuahuan Desert and just a year or two ago a family was visiting from France. They decided to take a hike in White Sands National Monument but only took a small bottle of water for each member of the 3 person family during the hottest summer months. They got lost and the parents were dead in just a very few hours. The son survived because the parents had given him their ration of water.
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