Freeze proof sink

Hi all, I just finished my longest trip in my truck camper so far (a little over a week) and came up with a list of things I want to improve. One of those things is using the sink during winter time. I dry camped during this most recent trip as the high temps were below freezing most of the week. The water jugs took up a ton of space and had to refill pretty frequently. Getting the sink running would be a big improvement, but I'd like it to either be freeze proof or very simple to winterize. Has anyone built something that can withstand freezing temps?

Hi all, I just finished my longest trip in my truck camper so far (a little over a week) and came up with a list of things I want to improve. One of those things is using the sink during winter time. I dry camped during this most recent trip as the high temps were below freezing most of the week. The water jugs took up a ton of space and had to refill pretty frequently. Getting the sink running would be a big improvement, but I'd like it to either be freeze proof or very simple to winterize. Has anyone built something that can withstand freezing temps?