I "winterized" our Pleasure Way Pursuit yesterday. I drained the water tank down to about 8 gal. and poured 3 gal. of RV anti freeze into the tank. Then I ran all the sink faucets both hot and cold, ...
If you search this Forum for `winterizing' or some such you will find almost no one recommends putting pink stuff into the Fresh Water Tank for the reasons stated in the posts. Sorry about that, Chief!