Winterizing RV

I personally don't want pink in the ice maker or filtered water. There is a shut off tap on that feed line. I shut that off and disconnect the line from valve and have wife inside to hold water valve open on fridge while I apply low air pressure to the line and removes all water from the fridge. It's a rather unnecessary feature in an RV but comes nowadays on household fridges. We use two water filters for the RV and can make all the ice we need and I don't buy a filter for fridge. Everything else including the dishwasher was already explained