This group focuses on surviving brief encounters of violent activity, including personal protection and its legal ramifications, danger awareness, John Boyd's cycle (also known as the OODA loop—observe, orient, decide and act), martial arts, self-defense tactics and tools (both lethal and non-lethal). These survivalist tactics are often firearm-oriented, in order to ensure a method of defense against attackers or home invasion.
Adherents of the back-to-the-land movement inspired by Helen and Scott Nearing, sporadically popular in the United States in the 1930s and 1970s (exemplified by The Mother Earth News magazine), share many of the same interests in self-sufficiency and preparedness. Back-to-the-landers differ from most survivalists in that they have a greater interest in ecology and counterculture. Despite these differences, The Mother Earth News was widely read by survivalists as well as back-to-the-landers during that magazine's early years, and there was some overlap between the two movements.
To me, the best option is to store emergency food. How much? If you have none, store enough for a few days. If you have enough for a few days, get enough for a week. How much you store depends on what time frame you think you're at risk for having to be completely independent. The early settlers of the southwest liked to store enough food for a whole year and still do to this day!