Me and DH have spent many years gathering skills and experimenting with various methods, so here are a few recommendations. We did it out of curiosity about forgotten skills and an urge to just try things out and see what happens. A hobby of sorts.
For food preservation there's a fascinating book, 'Preserving food without freezing or canning' which has recipes using such methods as using salt, oil, drying and lactic fermentation. The recipes all come from rural France.
https://www.amazon.co.uk/Preserving-Food-without-Freezing-Canning/dp/1933392592
'The art of fermentation' by Sandor Katz is interesting.
There is a useful RHS book on growing fruit and vegetables, 'Allotment month by month' which is very straightforward. They've also published a good book on herbs, what they do and how to use them.
'Building your own earth oven' gives guides on just that. Yes, we built one, it's brilliant and heats up to about 500C and cooks pizza in 1.5 minutes, after which you can cook in it for many hours as it cools.
www.abebooks.co.uk/servlet/BookDetailsPL
First-aid books are worth looking at too and there are many to choose from printed in the UK. 'Acupressure Techniques' by Julian Kenyon has some useful techniques and I've tried many over the years. Don't how it works but it does. In extremis, 'Where there is no doctor' and 'Where there is no dentist' are handy. We've both had a few adventures over the years and have been patching each other up for 40 years, with no ill effect. If you're out in the sticks, it's useful to know what to do when push comes to shove.
Finally, work on your head state so you don't lose the plot if/when the shit hits the fan. This could be learning to meditate and ground yourself, to yoga or whatever suits you best.