...we keep two 50 pound salt blocks on hand...one is out for the deer; one in reserve...you can get them at your local farm&feed store...get the plain salt...you don’t need the mineral/salt block....cattlemen buy that...salt might come in handy for food preservation and for trade bait.
I’m big on salt, but I never thought of those easy to store 50 pound blocks that I just googled and learn they sell for 6 dollars, everyone that is into long term survival should invest in a few of those.