I went camping two weekends ago with a bunch of Scout leaders and one of them turned out to be a chemist involved in the personal care business (owned his own company). I have read lots of reports that say that Dawn liquid dish soap is biodegradable and bio-friendly, so I asked the chemist for his take on comparing Dawn to the stuff sold as biodegradable camp soap. He said that Dawn was just as bio-friendly as all those camp soaps, and emphasized that non of them are good in direct contact with critters.

As for Bonners, keep in mind that the peppermint is an attractant to racoons, skunks, and (I suppose) bear. It also tends to makes one feel MUUUCH colder when washing/rinsing with cold lake/river water (away from the source of the water itself).

I've never thought of soap as a necessity in a survival kit, though it is a standard part of my first aid kit. Due to weight, I carry a small hotel-sized bar of soap instead of liquid soap.