Kartographer used to have a prepper thread that had many great links and discussions here on FR. Search for the older posts as he/she gave it up a few years back.
I have one now, have had for about 10 years. I stopped working on it because I realized that 99 out of a 100 people do not deserve to know this knowledge. I would only be helping those who would most definitely come and try to steal stuff from the good people who made the effort if the SHTF instead of doing their own work. Time for a cleansing of these characters and a reset.
Thinking about starting it up again but as a “closed community”.