In hot weather, as much as two gallons per person per day may be required. On desert backpack trips, the route and itinerary are planned around water sources. It is convenient but not always possible to be near a spring or stream for lunch stops and at camps. Collapsible water bags that will hold up to two gallons are available and should be carried in addition to reliable plastic water bottles. Collapsible containers make it possible to carry water for a dry lunch or even a dry camp.
Dry campsites are often very pleasant places such as ridges and hill tops.
However, plan to reach at least one reliable water source per day, unless the weather is cool and you are experienced in dry camping. Springs and streams shown on maps are often unreliable. The newest USGS topographic maps no longer clearly show the difference between permanent and seasonal stream beds. The best way to determine the reliability of desert water sources is through experience in the area, either yours or that of a trusted friend. Be aware of reliable water sources that are off your route.