We have well water with an electric pump, and in the event that we have no electricity we have no water. We do not own a generator and don't really want to buy one. We do have a spring on our property, however, and are thinking about buying something like this: http://www.rei.com/product/5963057.htm in case the electric was out for a long time and we needed fresh water for the family. (We have a wood/coal stove for heat and cooking, so aren't worried about those things). Would there be a better/cheaper way to ensure access to fresh water, or does this seem like a smart thing to buy? Thanks!