Worked in 'Nam!
I was gonna say it sounds like a Navy shower. Fresh water turned on for one hour only in the evening (one of the evaporators was usually broken). You jumped in, got wet, stepped out while the next got in to get wet. While he was in getting wet, you soaped up. When he stepped out, you jumped back in to rinse off. As many people as possible did this dance for the one hour fresh water was available, otherwise you ended up with a salt water shower.