Just a note, Salt literally cannot go bad. Salt can only be diluted or polluted. Nothing can live in salt, so the cheapest salt is usually found in baking sales (coming this month!), I picked up a 39 LB box (24-26oz cylinder boxes) for about $8 either early this year or late last year. As long as it doesnt get wet it will be fine. You can put it into a bucket, too.
“I’d recommend splitting the salt into smaller containers and then resealing them. This would give it a much longer shelf life.”
This would probably help you keep it manageable and keep it from getting wet, or all of it getting contaminated, etc. But just remember, it can’t spoil, so keep it clean and dry and you’re golden.
With the high humidity here in the Ohio Valley, unless you have a dehumidifier going, moisture is going to get into everything. The Indians were pretty smart when they used this region primarily as a hunting and war region and actually lived north of the Ohio and south of the Cumberland.