There are a lot of prepper types out there who might be theoretically 'ready" for societal collapse, but yes, they get there by already having a stockpile of societal goods and materials and of course guns. These folks likely have a great plan for what they're doing when the bombs fall, but likely not a shred of the social and communal skills necessary to keep a functional society alive for the long term.

Maybe some of the more isolated amish communities could subsist for a while without injections of modern supplies, but even still we're talking about less an "off grid" lifestyle and more like "radically reduced technology."