When boondocking for a long period (more than a week) we wash the day's dishes in the evening in one tub and rinse them in another tub with heated water and then quickly use the warm rinse water to partially wash bodies or maybe just head/hair. As others have said the dish water is used to flush toilet before bed time. When taking a shower, my wife uses a bit more water than I do for a shower, but I can pretty easily take a shower with 1/2 gal of water. I may not be ready to go to a fancy ball, but then I haven't seen any to go to when we are boondocking.
All this conservation of water can become necessary because our trailer only has a about 12 gals of fresh water.
We stayed at Malaquite in December for about 5 days. They do have showers and pit toilets. As well as the dump station with fresh water very close by. The sites are paved and you are almost right on the beach. No electricity . We got a lot of salt spray on the truck and fiver but the night before we left there was a spectacular lightning storm and then torrential rains which washed off the rig very well. It saved me a bunch of work. It was a nice stay.
So have the cold showers been upgraded to hot showers? What happened to the flush toilets at the campground?
A couple more pictures to show how not to park your RV unless absolutely necessary. As the first pic shows we were camped nicely away from others as they were too. seemed that at least 200ft or more between RVs - 4 miles of beach for two wheel drive vehicles is a lot to choose from! Anyhow, one morning we went for a long walk along the beach and came back to the second picture. We could not believe it. We pulled out the next day and moved to the north beach. That little blob on the ground just to the left end of our neighbor is their generator which ran most of the day - we use solar panels only - we don't have a generator. Nothing wrong with generators but the way this guy set up his Rv and generator showed he was just not thinking about his neighbors.