I looked more thoroughly on the way back but no camp spots so at the outskirts of Flüelen, I asked for help at the farm where I previously got water. They were hesitant to let me stay in their field, but only because they just sprayed liquid manure. I assumed the torrential rain had fixed most of it and anyway I had a tarp under my tent. I found the least sprayed/smelly area and pitched the tent before more on-and-off showers passed by...