One of the deals we made (wife and I) is that when we go sailing we're not going camping. We have 1000 litres of water in three tanks. I will install a home-made water maker before we go long terms cruising and will also have a custom-made rain catcher. We'll not be short of water. That said, we don't waste water but we don't camp either.
We wash our clothes in fresh because it takes more water to rinse salt out than to wash the clothes in the first instance and salty clothing will give you rashes and dermatitis. We have showers in both heads operated with trigger nozzles so you wet yourself down, soap up and then rinse off - no free-running water.
We carry enough linen to have fresh bedding whenever required and we do laundromats when we get into ports. Washing bedding at sea is too hard and it's not about water consumption.
We have no salt water on the boat other than toilet flush. We use only fresh in the galley for cooking and washing dishes and plastic garbage.
We sailed with three on board from San Diego to Marquesas. When we got to Nuku Hiva, the water was poor quality (undrinkable) so we never loaded any. We stayed for 5 days then sailed to Bora Bora. There the good water was limited so we only loaded 200 litres. We stayed there for 5 days too. We sailed to Raratonga where the water was again poor quality. We managed to get some from a ship that was stranded in the harbour but only filled one tank.
We stayed for 4 days then sailed to New Zealand. We were at sea altogether essentially for two and a half months and when we reached NZ we still had adequate water supplies. With a watermaker and rain catcher, we will have more water than we need - maybe we'll even sell some
If I have to cruise worrying about water to the point where I can't have a mouthful when I clean my teeth then I'll sell the boat and take up some other pass-time. That is not sailing - that's mental torture.