If you are a little bit handy you can make your own with pvc pipe.

Lot's of info if you Google.

A picture of the shower would be helpful.

;) There is no "shower" per se; it will be me using just the hose behind a screen. Nothing fancy, relatively private area, only my next-door neighbor on one side could accidentally see me.

I see so you will be naked ? I still need to see the place but I think the above solution is probably best or a screen that folds back when not in use but without a picture hard to say.

Kits that are sold at the big box stores.