Are we talking about a continuing natural disaster or just a spike in scarcity? If the former:
Even if you get right into the survival thing, and stock a warehouse full of food and the rest of the good stuff that has been discussed on this thread, such as water purification tablets; in the long run we're all screwed (not skewed - screwed) And royally so.
A warehouse full of supplies is finite, and unless a semblance of normalcy returns, and one can garden on a big scale, or buy food at a reasonable price again, everyone is going to go hungry.
That's assuming there's seeds to plant and food to buy, and jobs to make currency in order to buy.
If we're talking about a total collapse of the worlds' food supply with concomitant riots, murder, and mayhem, just tell me where ground zero is in this calamity, and I'll go there, put me head betwixt me legs and kiss me arse goodbye.
You can have my spinach.
:idea: