I think if you live in the middle of nowhere and there isn't something like nuclear fallout preventing health crops and rainwater then you can make it without even a lot of preparation. Humans never needed anything more than stone tools to get by in non-extreme climates unless there was a famine or war. If you don't live in the middle of nowhere you are basically going to be in the war scenario unless you manage to get to nowhere and either know how to hunt/forage or have seeds and are fortunate enough to get there at the right time of year. But of course if there are killer robots or a genetically modified virus to deal with that changes the equation.
I think if you live in the middle of nowhere and there isn't something like nuclear fallout preventing health crops and rainwater then you can make it without even a lot of preparation. Humans never needed anything more than stone tools to get by in non-extreme climates unless there was a famine or war. If you don't live in the middle of nowhere you are basically going to be in the war scenario unless you manage to get to nowhere and either know how to hunt/forage or have seeds and are fortunate enough to get there at the right time of year. But of course if there are killer robots or a genetically modified virus to deal with that changes the equation.