To conserve water...
A Turkish naval trick; jump into the sea, use hard sea sponge to clean yourself (scrap out the sead skin) then climb back on board, fill a small bucket with hot water add some soap in it and use a sponge to clean yourself, then use regular water and clean sponge to rinse... One person can clean like that with about 1/4 gallon of fresh water...
Another trick from Turkish navy; put alcohol on a piece of cloth, wipe yourself clean and wash the cloth with sea water...
I'd say use a raw water
pump to use for black water... Thus, the fresh water supply will last a long time...
We have a small sailboat (22ft) and all we have is a 5 gallon fresh water tank, that was sufficient for 2 day trip for two... Of course we swim then rinsed with a little fresh water for showers, washed all the vegetables and fruits before left the dock, and drinking water was bottled...
If you ask me it's not about the gender but personality...