Lady we know, not young mind you, takes a posthole digger with her - one that you screw and bang into the ground - puts her shower tent over hole and pile of dirt - as she "visits" she puts a shovelful of the dirt back into the hole - pretty clever I think.
Great idea Jules...for a 2 or 3 day stopover it would be ideal. I have an 8" post hole digger that would be easy to use and we would not need to cart the porta potti plus chemicals along.