Primitive tools/knife making/arrow tips.
Being able to make your own knifes, arrow tips and tools with your surrounding materials can be one of the most important things to your long term survival here are some examples of tools.
Flintknapp Knives Courtesy of Radharc Knives
Arrow heads Courtesy of Primitive Ways
Bone knives are a great and easy way to use every part of animals you catch.
Stone hammers and axes work great with shaping wood and other softer rocks.
Creating your own Mortar and Pestle can make preparing food much quicker and easier.