Just found this thread.
We are pleased to have Bear going with us on the trip in November. From my email communications with him he seems to be someone that's really interested in learning and getting the most he can get out of the trip. Our kinda folks. On this trip we are allowing tents since shelter building takes so much time and maintenance every day, and we want to use that time for other skills. We will be teaching shelter building though. So, the trip won't be "bare bones" but the participants are basically going to be limited to clothes on their back, water purification and storage container, light, knives, personal first aid kit, poncho, compass, fire building tools (lighter and ferrocerium) and camera gear. We will carry a small amount of food in for the first night but after that we either go hungry or eat what the jungle offers.
As for permethrin, let me give you one of our odd experiences using it. We treated our clothes with it during a Costa Rica trip once. Mike, myself, and a few others were up on top of a mountain rapelling down a waterfall. Of course we got soaking wet. After going off rope and getting back in the dry and sun, Mike started to develop an allergic reaction to the permethrin and had to remove his shirt and wash off before getting better. Not being sure if it was the permethrin he put the shirt back on and the reaction started again. So, we're not 100 percent sure it was the premethrin but since then he has not been able to wear any clothing treated with it. No one else was bothered by it. Anyway, since that time we have advised all of our jungle participants of the "risks" associated with using treated clothing.
Jeff Randall