Thanks Trap. Having searched the forums and seeing a few of your old comments I figured you'd done at least a little experimenting with it.
I agree, this stuff ain't cheap. What I read, though, indicates you can't get much of the good stuff from trapping tap water. The best stuff comes from the Dead Sea (interesting 2 religious groups settled near dead salt seas...). Fortunately, you can reconstitute it using dead sea salt, which isn't that expensive, and lye. I'm not much of a chemist, but I'm thinking I will give it a try. I also ordered sea salt for food seasoning, which contains m-state materials.
My first bottle arrived today, and I have a bottle of the platinum on the way which I will share with the family. If you're interested, I'd be happy to report in a month or so.