My daughter and I were having this conversation yesterday while out hiking and discussing our upcoming JMT hike. We plan to swim as often as possible. That's something I didn't do nearly enough of in '06. I also have a GSI dualist cooking system that includes a small sink that the pot sits in. My kid is going to prolly bring a few ounces of Dr. Bronners and use a few drops here & there - and rinse with a bandanna. I HATE the idea of soap in the backcounty, and don't personally carry it or advocate for it. So I emphasized the need to use only a COUPLE OF DROPS of a biodegradable soap - well away from any water sources. She was puzzled at first - but she gets it.