OP, don’t use antifreeze in the potable water system and that solves the problem of de-winterizing. Basically eliminates it.
Blow the lines out. AF in the pee traps.
Fill the tank with water right before you leave the house and drive until it ain’t cold anymore!
Or keep the camper heated and do nothing if you reasonably believe or know that will keep the potable system from freezing in late fall temps.
One is easier than the other if it works. Either is easier than winterizing the potable with AF and as a bonus, if you pick option 1, you’ll learn how to never have to muck up your water system with AF again.