If you buy about 5 or 6 of the blue Rubbermaid 6 gal. jugs, you can have them filled and sitting next to the washing machine. Everytime you wash a load of laundry, dump a jug into the washer, refill the jug, and put it at the end of the line. The water is always fresh and there is no waste. You'll always have around 30 gals. of emergency drinking water.