How much water does a person need a day trying to cross the desert?

A person crossing the desert typically needs about 3 to 4 liters (or about 0.8 to 1 gallon) of water per day to stay hydrated, depending on factors like temperature, humidity, and individual exertion levels. In extreme heat, this requirement can increase significantly, sometimes exceeding 6 liters. It's crucial to drink regularly to avoid dehydration, as symptoms can arise quickly in harsh desert conditions. Additionally, carrying extra water is advisable due to the unpredictable nature of desert environments.