You know who else liked the facts straight? Diogenes. Which is why when Plato said that man was defined as "a featherless biped" Diogenes defeathered a chicken and carried it up to Plato screaming, "Behold! I have brought you a man!"
Just wanted to add that to this comment thread because I love that story.
Honestly you could just go down to random underdeveloped areas and throw native berry bush seeds and stuff like that around. Then you know where it is if you need it. I've got quite a few areas where I've just found native edibles and know I can go to find them in a pinch.