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.