If You Get Sea Water

Desalinate it.

Or dilute it.

Desalination is done by evaporating sea water and collecting the vapours as they condense on some surface, for instance a transparent plastic sheet, if you do it under sun light, or a pan if you boil the sea water in a kettle.

Totally salt free water is not too goof either, distilled water can be improved in taste by adding a very small quantity of sea water to it./HGL