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It's called Kona Nigari, comes from 2,000 feet down off the coast of Hawaii, and it's bottled by Hawaii Deep Marine.
Kona Nigari is a seawater mineral concentrate you mix with regular water. You can buy some at the Key of Life store in the Royal Hawaiian Shopping Center in Honolulu.
As always with expensive weird shit, the Japanese are driving the market. They can't drink it fast enough.
They are apparently selling 80,000 2 oz. bottles A DAY to Japan, with each bottle going for $33.50. Wow.