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For the Preppers amongst us, the "water filtering vehicle" (short: WTF) is helping you to be able to create your own clean water. Using the energy while moving the WTF from one well to another, a pump/filter inside are cleaning the water and collect it into tanks. Using a fly wheel it's even possible to get the pressure as high as to use salty sea water as a source for drinking water. The filtering process can be done by hand but also using the energy left in car batteries.
The WTF keeps you from dying of thirst in times where clean water is rare. Or should we try to change things to prevent something like this from happening?
Bad Rodach, Germany