[Murray Kelly]

If you want to experiment with the calcium salt remember that carbonates and hydroxides will precipitate a cloud of insoluble calcium carbonate or hydroxide. Sulfites and borates are marginally soluble in water so that makes borax and sufites a poor choice and I have tried some with triethanolamine (TEA) as the alkali and that was apparently OK. No cloudiness. Also Calgon will make a good strong alkali solution and the calcium certainly shouldn't precipitate. That's what it's for, after all.

You could just eat the stuff and keep healthy, too.