I know for a fact that I would be a quick zombie snack. I don't really worry about myself as I do my wife and kids. Even if I was prepared with provisions, and I was in the right place at the right time I don't think that I could take on a group of looters or zombies. When you really take all different sort of factors into account, how does anyone survive. Look at Michael and the group at the Tower. Luck, pure luck.