I do admire Survivorman, but he cracks me up. I saw him break the glass off his flashlight bulb and use the filament to start a fire, then try to boil water in plastic container and rupture it. In his defense, though, he does actually go hungry and I have seen him be rescued in one episode. That really was realistic!!
I'm thinking I would not be ruining a perfectly good flashlight in a survival situation, would be great to signal with or see what is around if you hear something.. Amusingly, people come up with prehistoric ways to start a fire. Why not just throw a Bic lighter in your pack and another in your pocket. They last forever if you aren't wasteful and always work..
As for boiling water, makes a great case for getting the old aluminum G.I. canteens and a mess kit. Would be worth it's weight in gold if you were in the wilderness without them.