Many fine suggestions here, but unless I overlooked it, I didn't see anyone mention TOILET PAPER...me thinks this is most vital to survival. Another asset would be wild plant identification skills, not just for food, but tool and medicine uses as well.
I didnt read the thread but this post: in nature you dont use toilet paper but water or whatever. Knowing plants, animals, weather is necessary. If you dont know which clouds come in advance of which kind of storm system you can get lost...