I am not a survivalist, far from it. I'd make a terrible one as I am a vegetarian. I'v always found it more difficult to spot insects in the woods than in the fields. Sure you can pull up an old rock and maybe some rotten wood and find something including ants and worms which are edible, but typically what you find [here] are not as well known to be edible as the crickets/grasshoppers. Pill bugs, earwigs, and mili/centipedes.
If this was the sunny US southeast, I should say that kudzu (a plant) is edible and as an invasive species it grows everywhere. Queen Anne's lace is another plant that is edible with its carrot like root, but it similar to many parsnip type plants (including hogweed) which are poisonous to the touch.