Was looking for information on frost proof outdoor shower for lake
cabin. Found this retiree on Cape Cod with a simple little metalwork
modification to lawn hydrant (faucet) hardware. Seems to involve cast
iron drilling and tapping, but end result is a combination shower and
hot/cold water tap rig which automatically drains and will not burst in
cold weather.
http://www.geocities.com/dick_cryer/shower.html