Quick Answer
A solar still is a feasible option for collecting drinking water in survival situations, especially when a reliable water source is not available. This simple, low-tech method harnesses evaporation and condensation to purify water. With basic materials, you can build a solar still to access clean drinking water.
Building the Solar Still
To construct a solar still, you’ll need a container or hole, a clear plastic sheet, rocks or weights, and a container to collect the purified water. Dig a hole about 6-8 inches deep and 8-10 inches wide, then place a container in the center of the hole. Fill the hole with rocks or sand and add a small amount of water to the center container. Place the clear plastic sheet over the hole, weighing it down with rocks or sand.
Collecting and Purifying Water
As the sun heats the plastic sheet, water will evaporate from the center container and condense on the underside of the plastic. The condensed water will drip into the outer container, which will collect the purified water. To maximize collection, ensure the plastic sheet is tightly sealed and the rock or sand weight is evenly distributed. It’s essential to change the position of the still every few hours to ensure the plastic sheet is exposed to direct sunlight.
Maintenance and Safety
Regularly inspect the still for any signs of contamination or blockages, and clean it as needed. Avoid using the still during windy or extreme weather conditions, as this can compromise the effectiveness of the still. When collecting purified water, be cautious of potential contaminants in the surrounding environment, such as debris or wildlife.
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