Don't believe you can use your onboard pump to do what you are asking. Also don't believe you have a gravity fill either. Probably have to use an external pump (hand or electric) to fill your fresh water from a portable source.
If you were able to install some sort of tee and switch between the fresh water fill and the winterize connection, that may work.
__________________
ATC/NAC Jerry A. Burkholder, USN (RET.)
Rule #1. The Chief is always right.
Rule #2. When in doubt, refer to rule #1.
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