Good advice with the testing, Don. I forgot to mention, and I am sure most of you know, that a TDS meter can be purchased.... and you can test the water your self! just thought I would recommend an alternative to anyone who needs it. Still, I say that distilled water is completely fine, and it is considered "to pure" by anyone who wants to drink it... most, if not all of its ions and non-ionic organic contaminents are removed. in DI, the organic is left behind. I do not know this stuff from experience, just from researching the differences, but the main point, like Don stated above, is that it can be fine! Just test it!