I totally agree that surviving in the wilderness by living off the land is very difficult, even in peacetime. When the SHTF, it will be next to impossible as many will try the same thing despite not having the ability to succeed. That will mean the already limited resources will soon be depleted.
My thought is to have land where supplies can be pre-positioned by hiding them in various locations so if one cache was found, it would not mark the end of the enterprise. With planting and raising animals, long term survival is highly probable, provided the threats from outsiders can be avoided or at least defended against. It will still take many people if only to share sentry duty, though sharing in all tasks will be required.
For God, Family, Country, & Liberty!