I reread my comment from ...

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I reread my comment from several days ago and want to correct it. What I meant to say was:  I suppose you have to do it by exception. If the supplier is NOT a member of the International Bottled Water Association or equivalent and says so on the  label, or is certified by an appropriate organization, or a national or international commercial  brand, then you could conclude that there is a possibility that it might not be acceptable quality. You can easily check for bacteria using a colilert type test.   THe mmajor brands and certified products are good and tested. The local uncertified  brands or non brands have more potential for being questionable quality..