Good way to wash off dogs or yourself. It uses a weed sprayer bottle, and a shower head extension. The one bit I got that was interesting is the incoming tube in the sprayer may have restrictors in them that need to be removed (so you get a good flow of water). Oh and I get a kick out of the author trying to put the barbed end of the adapter onto the hose (I would have heated up the tube to get it over).
https://www.instructables.com/id/DIY-Portable-Camping-Shower-Rinser/