I installed 2 ge whole house filters and a pressure tank. When I plumbed it I installed a halve that lets me pump water into the fresh tank. Instead of going to the house, it diverts to a tee in the hose for my fresh water tank. I use the winterize valve and hose to pump water out of a 5 gallon container and it goes into the fresh tank. I can use a small folding hand cart to move the water jugs and dont have to lift anything.
Open the divert ball valve, switch the pump valve to winterize, stick the hose in the 5 gal jug.