Hunting, fishing, and trapping are also significant endeavors, ones that take much time and practice. These are also skills that are often times unnecessary in a short term survival situation. However if you are in a wilderness survival situation for any length of time, you'll want these skills. Throwing sticks, bow and arrow, primitive fishing, spear fishing, and primitive trapping are all important to learn.
Find other survivors. You've got your food, you've got your weapons, and you've staked out a place to stay. Now it's time to assemble a team a la The Walking Dead. Except that you want a team that is actually useful. When you consider taking on others (they're mouths to feed, after all), assess what they can do for you. Do they know plants? Are they a wizard with a javelin? Are they carrying their own stockpile of food?
Use diesel-powered vehicles. Hoarding gasoline won't work; the chemicals that once kept it fresh will degrade it in time. After a year or so, it goes bad. Chances are gas stations will run out of gasoline but there could be some diesel left. In addition, all military diesels can run on other fuels as well, from rotten kerosene to fermented leaves. So invest in something that can handle the harder fuels.
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