Considering that you are interested in survival techniques, let us give you some advice: If you are familiar with the flora and fauna of the region, city or country where you live, you will have more chances of surviving feeding from them in the event you suffer an emergency.
You should not only be familiar with the species in your area, but also know which ones are edible and which ones are not. In the case of animals, you should also get to know their habits and the ecosystems in which they live in order to ease the burden of their capture; in other words: knowing about them will make you a better hunter. In the case of plants, you should learn about the soil, behaviour during the various seasons, and techniques applicable for seeding and cultivating them.
Good knowledge of local plants may help you produce improvised candies, sweets, jellies and marmalades.
In all cases, you should learn about the nutritive peculiarities of each plant or animal. This will help you not only during the initial survival emergency, but in the long run will prevent vitamin or nutrient deficiencies.
Even in steppes and the tundra you can find things to eat, especially near water streams.
Survivalism is a discipline that demands continuous study; you cannot just depend on a manual and even if you have a good one, you will need some practice. Here at Andinia, aside from our work as computer programmers and site editors, we do some real-life survival practices from time to time, and we get to use those techniques anyway during our expeditions. You should do the same in order to get fit and stay fit in what regards to your survival capabilities.
More than just a pretty picture: In this picture, someone well versed in survival skills may see a lot of food gathering opps.