There are cancer protocols that recommend drinking distilled water and supplementing properly with your own minerals. I have not done this, as assimilating minerals is a problem for me, as with many candida people. I figure if I can get some assimilated through bottled spring water (not Evian as this brand may contain the awful Morgellan's bacteria. This produces a thread-like fungus that grows out of the skin.) I use Arrowhead and that seems to be ok. I liked ParaZapper's idea with the tall cylinder filled with water to see what settles. Maybe then you could get the sediment tested.