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Originally Posted by The Dark
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Speaking of coastal nations and salt fish, seawater's a decent way to get salt. A gallon of seawater evaporating will provide around 4.5 ounces of salt, so around 196 gallons of water will provide a bushel of salt. That sounds like a lot, but if you can set up evaporative pools, it's not too hard to mass produce. If it needs to be done quicker, it can be actively boiled, but that's likely to be prohibitively fuel-intensive for a post-apoc group. Although I could see coastal groups placing a pot of seawater over the fire whenever they're warming themselves in the winter, to harvest the salt.
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Setting up moveable plastic sheeting over the pools, weighted in the center to make a depression, with a collection bucket under the drip point would harvest pure, evaporated water as a byproduct of salt evaporation. It would probably also enhance the evaporative process, speeding it along.