We have a trailer located on an idaho lake. we pump water from the lake for showers and toilets. The set up that is in place now requires a great deal of effort to winterize, because of the work involved the place only gets used about 5 months out of the year. We would like to install a submersible pump with pressure tank and design it in such away that we could go out in the winter and easily turn on the water for the weekend and have the system easily drained when we leave. I would really appreciate any suggestion/drawings that would show me how to do this.