We use a hose with a ball built in it to siphon the water out of a container into the fresh water tank when we are boondocking. It is about 5' long and you simply move it up and down in the container until water starts to flow and it will run until the end of the hose is above the water. Real simple and CHEAP. I gave $5.00 for mine down here at Lowes. Home Depot also carries them. Maybe Canadian Tire or the outfit that sponsors the CFL, I can't remember their name would have them. They usually have them hanging from a shelf support along an aisle.