Outdoor shower for a clean green me, grateful green garden

outdoor room shower from trendir.com

My first outdoor shower experience was in Hawaii. The beach with its whales and white sand stretching before me, the volcanic mountain raising behind me, thick with butterflies, birds and flowers, with NOTHING between me and nature, but droplets of warm water.
I have wanted an outdoor shower ever since.
My garden has wanted me to have an outdoor shower, ever since the water restrictions began, and the sprinkling system was banished. To see good shower water go down the drain for no good reason makes me feel silly, when things I love are dying a few meters away.

Why do I still not have that outdoor shower?

Well, I need :
A gate, and some privacy screens so that I don't distress the neighbours.
maybe I could go to the Restorer's barn in Castlemaine, and get something quirky. Or look up a metalwork craft site
A way to get the water heated outside
coiled black pipe on the roof? How would I adjust the temperature? The water heater is less than a meter from where I want the shower. Plumber?
A way to get the water collected in swales, so seep slowly, without attracting mosquitoes.

A way to get excess water into the sewer, as legally required.
A Green plumber, again.

Portable outdoor shower from a Belgian Design site.
Water the dry patches of your garden, under the stars.
No soap, of course. Maybe Soapwart plant?

If you have any inspiring outdoor shower stories or pictures, or even better, practical advice, please click on the 'comments' below, and I will be grateful.