Find me the casual opportunist in the apocalypse; it would all be starving lions, and a lot of lions. If you want a preview, study famous famines and sieges, like the siege of Stalingrad, and the Holodomor. I’ll say it again, prepping for something other than limited disaster (i.e. a hurricane or earthquake) is only realistically achieved by trying to avert doom, or buy a gun and as many bullets as your family has members.