

As for the location, since after the collapse, hungry crowds will rob villages and farms that they can reach or know about, I will have to build a house from scratch somewhere a hundred kilometers from cities and civilization
I actually think places like villages are your best bet. An organized rural community of a few hundred people will be much better off than a single person or household living alone in the wilderness. You can share the work required and you’ll have a safety net in case anything goes wrong, like if you’ve been injured for example. You can also organize defence by putting up guards etc.

Is that really the point in that moment though? They didn’t invite you so you could teach them how to cook, but to spend time with you and have friendly conversations. Saying that would really only serve to ruin the day for them, and possibly for yourself as well depending on how they’ll react.