Seeds normally have a 2-3 year shelf-life. However, if you freeze the, they can last 5 years or more. Hence the seed vault in the great frozen tundra.
9mm would be for self-defense. It doesn't have the range or impact for hunting, unless you get up really close (relatively speaking). You could get a .308 or 30-30 in an AR-15 style instead of bolt action. That would give you a good hunting gun and a self-defense gun. However, I wouldn't use it as a home intruder gun in normal times, because the bullet would probably go places you don't want it to go.
I have an AR-15 in .223, but have been thinking of getting a good old 30-30 winchester or marlin. Much more stopping power and surprisingly ammo is not much more expensive. I have 2 9mm pistols and a .45, but yea .45 ammo is much more expensive.
I know there is a great debate between 9mm and .45.
I see it this way.
If your aim is good, even a .22 will kill, but I would rather be sure with a 9.
Having a bullpup or sub-machine gun using 9mm and possibly the same magazine, just adds to the usefulness of the caliber.
How I would equip myself.
If I can't get all the jobs done with that setup, then the job is too big for one person. ;)