not2sharp,
Hey, pard, I've thought about the same things over the years. I'm a retired Army CW4, now age 75, but still strong and active. My thoughts about if are:
1. Find a spot w-a-y back in the boonies. Perhaps a small clearing in the woods, along a hillside, whatever. However, a fair hike from obvious water of any kind. Why? Because that's where everyone else fleeing the city will go, along streams, lakes, ponds, etc. Then, when supplies start to run low there'll be warfare between groups to seize supplies, food, and so on. Stay away from that. I can hike out quietly and stealthily to get water, then fade back into my hideaway. Hell, I can even dig a well in the right spot.
2. Plan some ways other than hunting/fishing/trapping to supplement your food. Study up on the local area to see what naturally growing items can be consumed. Explore eating insects, perhaps even 'farming' productive bugs. Have a stock of something like Earth Boxes (Google these), a small container that can grow a lot of produce with minimal water. Stock up on seeds.
3. Use charcoal for fuel at your hideaway. However, trek out a few miles and set up some charcoal kilns. Go service them and pack the product back to the home location where you'll then have smoke free fuel for cooking and perhaps some heating.
4. Plan to stay secluded and away from everyone else for at least two to three years. During that time, the gangbangers and other fools will have slaughtered each other around shopping malls and supermarkets. Only the prepared and tough will survive and that will include you if you stay out of the panics and 'tribal' warfare near the cities/towns.
5. Weapons. Nothing beats a 22 and lots of ammo. Forget big bore rifles, shotguns, etc. Stock two or three quality 22 rifles. perhaps some 22 handguns, and many thousands of rounds of inexpensive ammo. Package and store it properly and it will last for many years.
6. Get proficient with silent killers such as bows/arrows, spears and atlatls, blowguns, slingshots, etc. Learn how to trap, snare, and fish but NOT close to your hideaway. Travel out a ways to get your game and pack it back. You want to be in your dense woods hideaway with no evidence you are there. If you slip up, someone will track you down, kill you, and take what you have. Sad fact of life.
7. Study and become proficient with the ways of preserving food and sustaining life with minimal necessities. Also learn first aid and natural remedies for common ailments. After all, you will be your own doctor, midwife, whatever, for quite a long time. Plan to stay in your hideaway for at least three years and forget about the rest of the world during that time. Curiousity killed the cat. After all that time you may be able to come out of the woods and reestablish contact with other reasonable people.....
Just my $.02.