Skills for TEOTWAWKI, long term survival

I'm trying to get a good list together of everything a community would need for very long term survival if SHTF in a very bad way. I want to make up a few binders, which would contain good information on everything needed to survive for a long time, including things that would make live more comfortable. Most of the things I'm looking for would be more primitive in nature, because if things went south in a bad way, doing things the way we do them now just wouldn't work. This post is for if things will never return to the way they were in your lifetime, or even your grandchildren's lifetime.

My list so far include:
Water - rivers, streams, springs. I also live near the beach, so desalination to make seawater drinkable
Food - hunting, fishing, farming, gathering. I have books on edible plants in my area, just ordered a book on butchering livestock and game.
Shelter - Houses will stand for a while, but will eventually need repair, or new ones built. Need to get good info on carpentry, etc. Also won't have running water, so bathing would need to be done differently, and outhouses would probably become the norm.
fire - We'll have lighters, matches, etc. for a while, but they'll eventually be gone, so I'm getting info on primitive methods to create a fire.
animals - Having domesticated animals would be useful in many ways. Food, transportation, pets, etc. People would need to know how to go about domesticating a wild animal, and raising them. Which i my area, isn't all too likely to be common knowledge.
Clothing - Well, this will last a while too, even more so with people repairing what they have, if SHTF lasts for a long time though, people will have to make their own clothing. I just ordered a book on making buckskins, need to look up more ways of making clothing though.
soap/sanitary items - This will be gone quickly. Sure, people can get by without them, but live is much more comfortable for most people if they have them. I need to look up way of creating these items from locally available resources.
medicine - This is something else that will be gone in under a year. I have a book on medicinal plants, but being able to make primitive medicines will be very useful.
weapons - guns won't last forever, and if they do, bullets wont. Need to find a way to make gunpowder from locally available resources. Once that wears itself out, spears can be made pretty easily, I would assume, and bows+arrows won't be great at first, but once people learn form their mistakes, they'll get better.
alcohol - May seem pointless at first, but people will want to drink. Being able to brew up alcoholic drinks will be a good thing because it will be something people will want, if they can't get it, they'll live, but it's a comfort item that people would enjoy. I'm currently brewing my first batch of mead, to make it sustainable, though, I would need to learn how to grow yeast, and have easy access to honey. I could use any kind of fruit to make an alcoholic drink if I really wanted to though.
knowledge - May not seem to important right away, but once things have become stable, to start the process of making live easier again, it will be important. I don't have a huge collection of textbooks or anything, nor do I plan on buying them, but if TSHTF in a bad way, it would make sense to go around to libraries, book stores, etc. and gather them up and store them in a safe place until things calmed down.

My list is nowhere near complete, which was why I made this post. There's no way I would be able to think up everything that would be needed, so anything you could add to my list would be appreciated.