I have a 2017 DBR38S3 Drv I bought new, it is located permanently in the North Carolina mountains. So, in the fall I leave for Florida for the winter. I have always had an rv service company winterize my coach, no problem. But this year I think I want to do it myself. The problem I have is the fill for the freshwater tank is designed for a garden type hose connection, I don’t seem to have a gravity inlet. So other than buying a pump to add antifreeze to my fresh water tank is there any way for me to add a few gallons of antifreeze to my tank so I can pump it through my coach?