Filling water tank without pressurized hook up

You don't need a pump or power to fill your water tank. You can fill it by gravity by getting the water jug higher than the hose connection on the rv. You will have to start the siphon by filling up a hose that is connected to the rv, and covering the other end with your finger while placing it in the water jug. I did this last summer at a music festival using my 15 gallon rubber storage containers to haul water in, and placing them on my truck tool box to empty them.