Subnautica 2 places you in the middle of an ocean, and the water is presumably full of salt. Unfortunately, that salt is of no use to you. Instead, you'll have to find some crystallized Salt to harvest if you want to craft with it. The good news is that Salt isn't the hardest resource to find and gather, even before you have the help of the Sonic Resonator to allow you to harvest the large nodes.
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