I wonder how effective a 1kg $1 box of salt would work. I guess it would have to be dumped into a Teflon mailing bag to breathe better than the box it comes in.

Then toss it every few months. Mold won’t grow on the salt itself, so could cook with it.

Or use it as driveway deicer.

Or just but the 10kg bags of rock salt in winter for driveway deicer for like $5.