Anyone know how to add an outdoor shower to '94 Pleasureway?

I tried to find it on the Transit Forum I read, but I know that a few cargo van conversions have used a shower curtain attached between the two back doors (opened) to create a shower "space", then used one of many different options for the shower itself. The simplest is a battery-operated handheld shower that gets placed in a bucket of warm water; but there are also gas-fired water heaters (or electric) that can be used for a portable shower