I agree with Dee.
The air rifles are neat and fun toys. Yes toys that can be deadly but still toys. My last day in Norfolk one kid was peeved at another and rode his bike home to get his BB gun, a pump up rifle and shot the other kid the BB went through the ribs and into the heart and the boy was dead before the fire department could get there 6 to 8 blocks away.
If you need to hunt in a populated area and are worried about over penitration to gather small animals (Rabbit, squrrels, rats, opossum, raccoon, skunk) or small birds ( dove, quail, pigeon, or song birds) If you think you are going to deter or stop someone from trying to take what supplies you have (food, fuel, water, $, or other items) your mistaken. As Dee said nothing beats the power of a shotgun for defense.
a 22 rifle gives you the ability to vary ammo from quieter than air rifle to standard stuff that works great on up to meduim game.
the advantage the 22 has is it can be reloaded quickly. Even my single shot rim fire can be loaded faster than any air rifle for fast follow up or a second target. A shot at a rabit for me usually gets another to move.
A shotgun for the same reason is a great tool. From bird shot to buck shot. I have used buck to shoot a woodcock when deer hunting.
Got lucky and took the whole head off only but it was a good body to eat and in a survival meat is meat.
But if something were to happen tomorrow. You would use what you have and what you have ammo for in what ever role you need it to do. Yes it would be great to think about what you want to have and use it acordingly