So what I have done, when I want to fill from my portable 5 gallon jug. I place the jug next to my water pump where my winterizing pickup tube is located. Change the valve locations to winterizing. Then I go outside and remove the outside shower head, and shove it down my gravity fill port. Now, you could modify your shower head, to except a male hose fitting on the end, you could there connect it to the fill port, or add a hose and bring it around and connect.
Once connected, turn on the pump, and fill the onboard tank. When the jug is empty, turn off the pump and get another jug of water, repeat as needed. Once done, remember to flip the to use the onboard tank. Very easy to do.
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