Salt, pepper, some chili powder, mustard, sugar, honey – the list is endless.  These items do not need to cost a lot nor do they need to take up an extraordinary amount of space.  When push comes to shove, however, your eating experience will be greatly enhanced by having a variety of flavor enhancers on hand to enliven the taste of your stored food stuffs.
Personal defense items – such as rifles and heavy firearms – are going to be increasinly hard to manage the farther you move from steady supplies.  Ironically, it’s firearms that help acquire more food, provide personal protection, and deter others from attacking.  In a SHTF scenario, heavy armament is only good within fortified areas.  If you want to stay highly mobile, switch down to a .22LR polymer rifle such as the Savage survival rifle or similar.  Lightweight, collapsible, and perfect for hunting game.  Loaded with subsonic rounds, it can also be a lot more efficient than heading off a target with a loud 30-06.