Letting ocean water evaporate is good. You will also get trace minerals from that.
When you sweat you release salt, potassium, and other minerals. Sodium chloride replenishes the sodium part, so salt is very important. You might do some research on where the ancient Egyptians got their "salts" to make mummies. ("Salt" is also a generic term for a class of water soluble compounds.) They used sodium chloride, salt peter (potassium nitrate?), spices, and some other things.
You could also go to downtown Detroit, drill straight down. Underneath Detroit is a HUGE salt mine. It was going for like 80 years, and I think they stopped taking salt out of it because they thought it might destabilize the city.
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