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Not necessarily. Leafy plants are easy to grow inside, but they don't provide calories. Potatoes are probably the easiest to grow source of calories, but honestly I think indoor aquaponics could be the entire future of survival food. I have seen tomatoes grow from seeds to fruit in literally 3 weeks in a fill-drain aquaponics system, which also had some 60 fish in it.

There are a thousand way to provide electricity. Probably don't need to go into that here.

Though the speeds would be ass (like going back to dialup internet), most modern triband radios support a digital form of radio that can be used to e.g. transfer files encrypted, and supports repeaters. It really is the underpinnings of a SHTF meshnet, except where every node has a range of miles LOS.