What the others said about lighting a fire. For me the satisfaction of “Leaving no trace” is one of the main things about wild camping.
Even if you do it properly and dig up the soil, it still damages the ground and its impossible to restore the ground so there is no sign.
Nothing worse than finding a sweet spot and seeing a blackened circle. Sorry if i sound like a sanctimonious prick, but really does piss me off.
Oh yeah and if you do need a number2, dig a hole away from the site, and bag out your paper please 😀
The whole “microadventure” thing seems to be steadily growing, and if we damage where we camp, landowners are likely to be far less tolerant.