More thoughts since we're past edit timeline:
That's a longer topic that both myself and some other people have discussed in depth.
Location matters quite a bit as to what your concerns would be. Terrence Popp says you want to be at least 50 miles outside of any large city (based on his rather extensive military experience across multiple wars and other "classified operations".). My argument is that ideally you would be located in any one of the countless little "micro towns" (under 500 population) in the US where you can get to know your neighbors and people will be inclined to help each other out.
Here's my two points I'd highlight:
1 - In terms of prepping and buying food, my answer is going to be "Yes, and get to a 12 month supply if you can". The reason why is fairly simple: if you aren't already feeding yourself it will take that long to get there. If you already are capable of feeding yourself you still need an extra year's supply on hand in case a draught, freeze, or other weather event destroys your harvest for the year.
2 - To repeat my earlier recommendation: make sure you learn a good "apocalypse" skill. Taking an engine mechanic's course is one possible avenue. Otherwise look at good "prison skills". If you can woodwork, do electrical repair, or perform other maintenance services those are better than gold. Alternatively there's a number of "make stuff" skills which are highly valued. If you're the guy in the neighborhood who can moonshine the odds are you'll be very popular during an economic collapse.
So you are suggesting homesteading, growing your own food? I have long wanted to do that too, for avoiding toxic pesticides and other chemicals that they put in the food.
The question is, where to go for homesteading? There should be good arable land, plenty clean water, and a climate hospitable for growing multiple harvests per year. Obviously Montana or Wyoming would be bad for homesteading because of the intensely harsh winters. I actually think that any of the central plains states would be not so good for homesteading, because they are exposed to freezing winter winds coming from Canada, which go down all the way to Texas even. I'm afraid that frosts could very easily do a lot of damage to trees and plants. Also the plains states tend to have lots of tornadoes. Even if you have a basement bunker, the tornado can wipe out your garden/orchard, depriving you of harvest.
Some people have theorized that there exist climate modification devices which can amplify the destructive effects of such harsh weather. I don't know anything about how such devices could possibly work, do I don't believe in that theory, but I would want to stay on the safe side just in case.
The mountainous regions of California maybe make sense for homesteading, as they have a climate favorable for growing plants, and are sheltered from storms and extreme weather phenomena. Wells can solve the problem of drought.