Vivi,
I would suggest that you start hunting, fishing and trapping you are going to have to feed yourself in the wild, gathering plant food is only going to go so far. You mentioned that there is a poluted stream close to the woods you frequent, if it has fish, it is a great place to practice techniques, even though you can't eat the fish there you can practice catching them and release to catch again another day. I am sure that there is a stream, lake or pond near by that you can use to practice fishing if you are not already an accomplished fisherman, this is one thing that surprised me about Chris McCandless, I don't remember any reference to him fishing.
From your other posts I get the idea you do not have a gun or hunt, this is a very important skill for wilderness survival. Decent guns to hunt with are not as expensive as you may think, I would suggest a used 20 gauge single shot shotgun. With this gun you can take both large and small game just by changing the load, as has been mentioned before a 22 is also a very good choice. A 22 is small, light, accurate, shoots quitely, compared to other calibers, and absolutely lethal to animals up to the size of raccoons, in a true survival situation, with good marksmanship, perhaps quite a bit bigger and ammo is very cheap and plentiful. A used bolt action single shot from any of the major manufacturers would be a good place to start. You should be able to find either the shotgun or 22 for under 100 dollars.
Still another route is black powder guns, the long hunters, courier de bois, trappers, and mountain men of the 18th and 19th century were definitely survivors, and depended on muskets and black powder rifles to fill their pot. I had a post earlier about the virtues of a muzzle loading shotgun as a primary survival gun. In most states black powder guns can be ordered and delivered through the mail.
Trapping, you mentioned that you practice building snares, have you actually caught animals in them? If not keep working on your techniques until you do then clean, prepare cook and eat what you catch. Several of us have suggested conibear body grip traps, order some through the mail and learn to use, set, bait and actually catch animals with them, an actual situation is not the time to learn how to catch your food.
I am not suggesting you do anything illegal, always have permission to be on the land you are using or utilize public land. Have the appropriate license and obtain your firearms legally, do not poach game, either by hunting or trapping.
Also build and get in the habit of carrying a first aid kit, even if it is very basic, a stomach problem or common cold in the wild that keeps you from foraging or hunting for a few days might be what puts you over the edge. It would suck to die from something that a little immodium AD would have cured, or a cut you could have easily closed or kept from getting infected.
I hope I have given you some good ideas, living in the woods is my life, and has been for as long as I can remember. I know I am not as good as a bunch of folks on this site, but a good portion of the food that makes it to my dinner table is provided by my own hand.
