As I was hunkered down and collecting water a woman came up behind me with a plastic water bottle and filled it up from the tube closest to her. We exchanged greetings. Her bottle took very little time to fill and as she capped it she walked in the forested area adjacent and said: "I hope you don't mind but I really need to go." I don't particularly know what would've happened if I did mind because the elastic band was already around her hips at the end of her sentence (peripheral vision is sometimes rough). Of course in my current position I am probably one of the most understanding pee-in-public people you'll run across. Heck, this may even be another form of offering.