Nope, no salt showers.So youse submariners didn't have salt water showers? WW2 can i was on for my first cruise ended up w/ a lack of fresh water (some sort of boiler issues) and we got salt water showers for a while in Westpac. Not real gratifying when the idea is to reduce the crust from spray after standing bridge wing watches.
The goal was to cut water usage to 20 gallons per day per person (which reduced wear & tear on the evaporator). That included water used for cooking, dishwashing, and laundry. Even at 1-2 showers per week it's more challenging than you'd expect.
The toilets are flushed with salt water. The engineering spaces have any number of handy valves to obtain salt water for a birdbath, but it doesn't soap up very well and it can really irritate the skin. Of course if it's a choice of hydraulic oil, bilges, or carbon dust then I'll take the salt water.