A sturdy bolt-action sporter- I prefer milsurps in .30-06- will be the best "kill anything big" choice.
Some powerful but concealable handgun- a Ruger Alaskan is just a laughable choice, unless you're so large that
you don't really need a weapon to take on bear. A 10mm or 3-4" .357 is probably about ideal...
This is about the lightest you can go. If you had a .357, you could use lead round-nose .38s to harvest small game like rabbits and squirrels.
Adding a shotgun gives more versatility, though a lot of what the shotgun gives is less survival and more sport.
Adding a rimfire gives more versatility. There is little you couldn't do pretty well, shooting-wise, in N America with a good bolt-action .30 rifle, a quality 3-4" .357 handgun, a shotgun with slug and longer small game barrel, and a good .22.
Sure, if you're less about survival, and want to optimize, you could, for instance, add a good autoloader for daily carry. If you have the
leisure of gun sports, you could add a lighter rifle for varminting, etc...but folks who seem to think you "need" over 10 firearms at the least are living in a different universe.
Sure, I have more, but I understand that
need has nothing to do with it.