If you can get just the pure salt blocks, no additives. it makes a great way to store large quantities of salt for any human comsupmtion Very valuable WSHTF for curing, cooking, etc. And it comes in a huge package, just stack em and keep em dry, last forever.
All the other things is a great idea as well. hunting will be hard enough when "everyone" is doing it, might as well stack the odds in your favor.
Something I'm starting soon is a worm farm. Not only good for bait, but if you feed your scraps, leaves, etc, they will turn it into the best dirt you can imagine. I'll get a thread going once I'm up and running.