Re: kupkać każdy musi, ale....

za morzami juz doktoraty porobili na tym temacie
...First, before you leave home, decide what you will do about toilet paper. If you insist on having it, be warned you will have to carry the used paper out with you, preferably double-bagged. A more environmentally-friendly (and less disgusting) method is to use "natural toilet paper" - leaves, sticks, etc.

How To Defecate-Properly-Outdoors [www.wikihow.com]

....Gleba pod drogą jest płaska, porośnięta trawą i bez kamieni.