Yeah I would think that water is ok since it has been purified. I don't have any experience with it though, I have only used distilled water in Viper's beads:
http://www.heartfeltindustries.com/products.asp?cat=14
He also is selling the calibration kits:
http://www.heartfeltindustries.com/products.asp?cat=23
And one stop shopping:
http://www.heartfeltindustries.com/products.asp?cat=10
Using the beads will be one of the best things you can do for your personal storage.
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