Hi Selco, Tho your English is part of your charm.. the correct term is “mind your own business”. :-). Just thought you would like to learn for future use.
While I have your attention.. I was going to ask if you thought that waste cooking oil was a useful thing to store. The “fish and chip” shops throw out lots of it every week. I suppose it could be used to make the primitive oil lamps you talk about. In a SHTF time you might even use it to cook if you had no choice??