Solar Still: how to collect water in hot climates. Solar Still is an old-school technique to collect water in hot climates like the desert, it requires a little to no efforts which make it ideal to the survivor.
Determine remaining daylight on your hand. Use this simple trick to measure the remaining daylight without a watch. Count the finger widths between the sun and the horizon. Each finger is equivalent to 15 minutes, with each hand totaling an hour.