A trash can, or specially made EMP bags, like this is the easiest approach I've seen tested by an expert:
hooktube.com/watch?v=uYWhTMmv6bs
Salt is a really good topic for sidequest digging.
How did industrial 'table salt' become the type that almost everyone in America uses every day? What did people use before that?
How many minerals are in table salt vs. Himalayan or Celtic salt?