They get what I drink - Spring Mineral Water. A Breeder in California told me that he gives his Distilled Water to eliminate the Tear Stains, he said it was caused by the minerals in the water. I don't know how true this is? I have never heard it before and all 8 of my Yorkie books make no mention of this subject. Could it be that at the time of printing (some time ago?) That water filtration sytems were'nt as bad for you as they are today in this day and age?