Two comments on desertrat1's post:
I agree a multitool is the prime "knife" handy for most daily use, but get a quality one such as a Leatherman as he suggested. Forget the knockoffs. Buy quality up front because you'l use it for a long time.
I do wish we'd get away from the Rambo idea of attaching your fixed blade knife to a stick for a spear point. A great way to loose the most important wilderness survival tool you have. Fire harden your fresh cut pole, use a piece of flaked stone, scrap metal from the crashed plane, whatever, but NOT the knife.