We live about 150 feet from a year round creek. We are probably 10 or 15 feet higher than the creek. We don't get much sun so solar is not much of an option. The creek is very gradual grade so a ram pump is kind of out of the question. We need to fill a 55 gallon drum that will gravity feed a tankless propane water heater and a sink. How the hay do we pump water into this bugger? Any help or suggestions would be great.