Anyone truly interested in survival in a true SHTF scenario would be well served by reading the articles written by Selco.
Selco's blogs From the site: "Selco survived the Balkan war of the 90s in a city under siege, without electricity, running water, or food distribution."
His experiences talk about actually living this situation, rather than the conjecture that is so prevalent on the internet on the subject. Personally, I found his work really eye-opening. He discusses the important of mindset in great detail, and covers a lot of fallacies about dealing with life after a collapse.