I Like one of the systems that Andrews water uses a LRG imersion heater into the holding tank gives you warm water to start the day with..
I tryed the cheaper version a Wickes imershion heater in the van tank for a couple of hrs before I started, Increased TDS to about 9 but generally worked well in so far as it alowed me to start as usual on the really cold FREEZING days and TDS did not give me any comeback
PS Southern Comfort also slurrs the fingers when typing...