Thanks LLR, those 2 points hit the nail on the head. I edited them into the first post.This is an interesting topic that I've thought about from time to time over the years.
I think you have to start from 2 slightly different questions, which lead to different but possibly overlapping answers:
1. In a homesteading situation, how much of modern life is feasible to become self reliant/self producing?
2. In a disaster/SHTF/Zombie Apoc/whatever situation, what will I be deprived of that I need to stock up on now?
Relating to question 1 and 2, the big one is electricity. If you can become self reliant and make your own electricity, you're way ahead of the game in either situation. Personally I think solar is a dead end in this regard. My own idea is to have a natural gas generator that is sealed up and the waste heat from the generator used for home heating. With the generator hooked up to a battery + inverter system, you can run your normal power needs through only having a gas line hookup instead of having a gas line + electrical power hookup. If you then add a natural gas storage tank to this system to account for interruptions in gas line service you're only limited by the size of the tank(s) you have access to. Natural gas generators are pretty efficient these days, and if you were careful with your power needs you could get 500-1000GAL of natural gas to last quite a while in an emergency. You could also set up the system to be able to hook a portable diesel generator to it as well for a backup to the NG generator.
The downside is the cost of course. You have to pay for the generator, the gas lines, the tank, the battery system, and then engineer a facility designed to direct the heat towards heating something useful in the house. The savings you'll get from that compared to what your power bill currently is is likely negligible at best. But is cost really that much of a concern if you're talking about the situations you're planning for?
Relating to question 2, it's a question of identifying what you really need to survive, and then what would be nice to have that you couldn't get in a situation where the nationwide on-demand supply chain breaks down. I haven't put a lot of thought into this because it's such a broad question. You basically only NEED food, water, shelter to survive, but there's all kinds of things that fall into the nice to have category. The main things I come back to are those water filter straw gizmos I see advertised sometimes, and Night Vision of some kind. NV would be extremely useful in an emergency situation or SHTF situation, and probably more valuable than gold.
The generator effort you're describing is pretty much how I'd keep myself busy if I was rich as shit and didn't work. I tell my woman "God help you all if I ever win the lottery" all of the time, because I'd move us even further out into the (warm) country and building "Fort Commune" would be my only hobby. It's either that, or my Restaurant & Man-Campus idea, but that's a different thread. Electricity is definitely the one that I'm always scratching my head about though because that and medicine are about the only things I can think of that I would want, but really can't build anything effective myself. I know that I'm mixing the practical and the interesting components of this whole exercise here. I always end up back at those hand-crank generators or ones that run on motion/movement that people use to charge their cell phones and flashlights on long hikes and shit. Those essentially run on calories and I know how to make fuel for more calories. I don't know how to make fossil fuels, though.
#2 - So you're telling me I need to order one of these pulsar scopes? Can you write a letter to my wife? Maybe tell her I need one of these, too.
Having gone through SERE and some other less intense survival training, it is hard to overstate the quality of life improvement from having soy sauce, tabasco, cholula, or some other flavoring to add to your food.
I tried so many fucking times to cross train into SERE instructor when I was enlisted, along with EOD & Aerial Gunner. I get why you can't be colorblind and do the other two, but the SERE one really pissed me off.