Check out this article on CNN's website.
Seems like it's the ones who can think who survive. Go figure. I'll sum it up by listing what qualities make for a good survivalist.
Strong Family Ties
Thankfully I have these bases covered, although here in the "Nuclear Family" Northeast, I consider my family to extend to my close friends. I would add that one skill needed is to be able to make the hard choices. If your brother has gangrene, well without antibiotics he's going to die. You need to be mentally prepared to face the hard decisions around him. If there is no way of getting him the medication you're going to have to chop off the leg, which might kill him anyway. Or if it's too far along, then you might have to euthanize him. It's a horrible thought, and I wouldn't dwell on such thoughts, but acknowledge you might have to make that call, then get on with living in the here and now.
It's a tough balance to think about the horrible things that could happen in the future, but keep living in the here and now. It's hard for me to read 5-10 articles about economic doom and gloom, then pony up the $10 to see a movie for entertainment. We need that, though. If we focus on the doom and gloom then we lose the gift of life we have now.