This allows you to turn dirty water into clean drinking water using only the sun. This can potentially supply everyone on the planet with clean drinking water, even in the middle of a jungle or out at sea.
Always use the dirty bottle as the dirty bottle and the clean bottle as the clean bottle, otherwise you might drink in germs and get sick. Make sure to color and mark the bottles accordingly, and do not dip the tube into dirty water. Draw the tube onto the clean bottle, and color the clean bottle differently than the dirty bottle.
Make sure both bottles are transparent so you see exactly where the dirty and clean water are. If a bottle is contaminated, throw it away or clean it very, very well.
One bottle is not worth your health.
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