Using Water 4 times
If you're really REALLY stingy with water (and you should be in the desert) you can make one quart of water pull "quadruple duty" with a reasonably sized basin/mess kit pot:
1) Brush Teeth (use very little)
2) Boil for coffee
3) Shave and wash once the boiled water cools down (w/baking soda added)
4) Wash socks/drawers in remainder (w/baking soda added)
It takes a bit of a knack but it's a good skill to learn when water's tight.
Not so much that water is tight, but that you cannot just pour it out. You evap it, or you put it in jugs to haul out. Given we have a utility trailer, I'd rather haul out dirty laundry than dirty water.