It was probably one of the History Channel's better treatments of a societal collapse theme in recent years.
Now I see someone's posted After Armageddon on YouTube in its entirety.
The docudrama starts off with a pandemic scenario, but don't get bogged down with that. As you get farther into the show, it follows a family of three as they deal with situations that would have broader applications.
If the show disappears from YouTube, or you simply want a hard-copy of your own, the After Armageddon DVD is available on Amazon.