I'm not out longer than a few days, usually. I don't think there's any, "perfect system," unfortunately.
To me, it goes like this:
...pick 2

That being said, this is not a bad balance, if you ask me. It'll get tiresome after a while, but I can usually scrounge up something while in the woods to add some variety. Even if it's just some mushrooms.
"Without craftsmanship, inspiration is a mere reed shaken in the wind." - Johannes Brahms