A few summers ago, we rented a lake house that had an outdoor shower. Showering outside was something we all enjoyed. Billy came up with the idea to build one in our pool area. He poured a concrete slab and tied into the plumbing from inside the house. We did some research online and found the idea to use vinyl fencing to create the shower enclosure. We bought 3 pieces of 6 ft vinyl fencing and used a gate hinge to make the door. We also added some privacy lattice to ensure privacy from anyone who might be on the deck above.
We added some river rock around the base and pavers for a path.
We hang some shower supplies in Target dollar section containers.
We also created a shelf from rust resistant L-brackets that hold up a shelf made from a piece of extra fencing as we had to cut one panel down).