Porta-potties??? Where??? There aren't any around here, that's for sure! What a great concept! (but who would pay for them??)

But there are LOTS of trees and woods and bushes around here and it's not too hard to find a hidden spot in the fields and bushes right off the side of the road. I find if I lay my bike right down in the tall grass instead of leaning it against a tree, then motorists won't see it, slow down, or wonder who's (free?) bike it is.
I just pee fast and use some leaves or grass. I avoid the poison ivy though.
I can usually do up to a 3 hour ride without going.