"If you can't just pick it and eat it , its not "survival" food."
Oh, I would disagree with that. Survival food is any food you eat in a survival situation. What the Indians called "Starvation food." There are a lot of edible plants that require some degree of processing.
That said, I agree that most acorns require a RIDICULOUS amount of processing. But then, so does manioc, and it's a staple in many parts of the world.
I remember reading about some sort of acorn that could be safely eaten raw, but I forget which one. And I probably couldn't spot it among it's less-tasteful cousins, anyway.