If you are not using water in the RV and just want safe storage simply blow out the water in the lines. Any water in a water heater or sink drain should be ok if you keep the heat on minimum.
Blowout is the simplest if you have a small air compressor. Attach via the water inlet and run out any stored water then run air through all the lines. Several youtubes on how to.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6