You guys, its good that you are "prepping" for TEOTWAWKI, but keep some things in mind.
Using precious metals to barter - like silver, gold, or platinum? What is to stop the person you are bartering with to just point a gun at you, and demand everything you have, including barter price?
Saving up on food/canned goods/classical canned (in mason jars)? While it is paramount to prepare, be weary that you can save up on food for TEOTWAWKI, only to get sick and possibly die of hepatitis A.
Have you strategically placed your "prep" items in certain places? Be cognizant of where these things are placed. If, say, an earthquake happens while you are at work, it will be hard to get to your hard-worked-for "prepper" items. Unpredictable relocation and dislocation may make caches of prepper items useless, depending on the circumstances.
Who do you trust? In a time when the world (as we know it) is ending, human emotions tend to trend on extremes. Neighbors that once were considered friends may be formidable enemies when the desperation of survival kicks in. Likewise, enemies could show themselves to be great assets.
Mental prepping is the most important. The possibility of living in the wilderness, or the trauma of family/friends turning against you for the sake of survival can be heavy on the mind and spirit. Moreover, corralling one's lusts and vices are necessary for survival. There is a story of Jewish refugees during Nazi Germany that lived in the forest for a long while, but the lust for truffles (and seeking them out where soldiers were stationed) by two of the lot eventually got them found. Forget your want for a juicy porterhouse steak, or a warm scotch, or a cigarette...
Luckily for the majority on this thread, we are Christian. So, we know most of this stuff stated above anyway (especially concerning wants, and discerning character.) But, we are also human. While we are getting carpal tunnel syndrome talking about what we are doing to prepare, we are afforded the luxury of doing just that. So many variables will be introduced to test us if/when an asteroid collision, super quake, hypercane, nooklear, etc. befalls us. Take care all. Trust God (easier said than done, but not really.)