I use something about 1/4 Liter to wash my hands and face. Less for brushing my teeth in the morning. Water use,, especially in a bathroom sink, is very easily decreased to next to nothing if you shut off the tap between actions. My group was challenged to experience living without services 1 day per week and I found that I could get a very nice "shower" by standing in the tub with a wash cloth, a bucket, and 2 Liters of water. As I do when I am camping. And room temp water is only really cold when you hose yourself down at 20 Liters per minute.
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