I thought you might like this little video. Nice fellow showing us how to find fuel in the forest, build a shelter with a tarp, as well as make a chair...
Most important, is simply to switch your brain from "what can I buy to solve this problem", to how can I adapt the existing environment.
Also, I found it interesting that he was using the term basher for a tarp. Then I remembered that in French, a tarp is a bache. And just to confound things , a quick Wikipedia searche revealed that, basha also means shelter in Malay...

Some people have a harder time surviving in the outdoors than others...