I have to laugh--I loathe plastic porta potties as well (there's something about the greenhouse effect of all that plastic, heat, fermentation events--blech). But I don't mind wooden outhouses or the composting toilets that the Forest Service puts up at trailheads now. As a field ecologist, back in grad school I used to go 6 months at a time without coming anywhere near a real flush toilet. (Actually, I still do: my summer field site has a composting toilet, but no running water, and I spend 4 months each summer up here.)

When I got back to Seattle from my field sites, I always had a few days where I had to remind myself that I couldn't just step behind a tree in any park and let 'er fly.

What's bad is the combination of dry suit and long kayak crossings. I tend to drink far too little, because you just can't hop out of your kayak on a crossing. And even when you do get to shore, wiggling out of that damned drysuit is no fun. It's easier (and dumber) just not to drink enough water.