You could use a tank tee with a pressure switch and small expansion tank and power up an inexpensive submersible well pump. Terry can set this up for you for likely the same money as you'd pay buying at Lowes.
Then you could use heat tape to keep it all from freezing or blow it out when done showering(you could put an air fitting right on the tank tee drain).
Edit: or use the 12V pump from amazon and run from a marine deep cycle battery and use a battery tender to recharge it.
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