Right GAHD! I lived in Bermuda in the late 80's. Many or all of the local buildings and homes were made of limestone with the roof white and "staggered" with collection holes to collect water in tanks beneath the structure. In the "basement" there were filtering systems to utilize the water. It's quite remarkable actually. I once asked the same question about separating salt from salt water. Sure Bermuda is in the Atlantic ocean, but they also have dry spouts. I think as GAHD said they have a system to take sea water to condence the water which is then cooled and collected into another tank. I will have to check for better details.

ONE HUGE THING. As was suggested be sure to check with your health care provider before altering your diet. This especially with potassium or salt substitutes which often (not all) are of a potassium derivative. Anyone on Potassium sparing diuretics does not want to add potassium to the diet. Hyperkalemia can lead to death.
I wish the pissy bugger UncleAl

would piss off into his own crappy world and leave everyone else alone. GET A GRIP.

My husband is from California and would never talk to anyone like that which means you're probably still 15 years old in your head and mouth.
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Star30
Florence Nightingale: It may seem a strange principle to enunciate as the very first requirement in a Hospital that it should do the sick no harm. [1859]