People who don't keep faei may eat salt from the ocean or salt mines. There is, however, salt content in plants and animals, which can be derived from them. Most salt sold in Linnip proper is harvested from a grass which grows near the sea and sequesters salt in accessible pockets, but, for example, when blood is a byproduct of animal slaughter, salt can be extracted from that.
Re: [elcenia question] Question for an Aleist priestess