Plentiful fresh drinking water for drinking, cooking, washing, and gardening is the most critical resource for all societies. The vast majority of the residents of First World countries are dependent on grid power to supply their water. When the grid goes down for more than a few days, water towers will soon be drained and huge numbers of people will be forced to draw water from open sources. Thankfully, there are streams, rivers, lakes, and ponds in walking distance of most homes. Rainwater from roof downspouts can also be used. But the logistics of hauling water will be a challenge, …