Distilled water is highly acidic and should not be used for drinking. Did you know that it takes 8 fresh gallons of water to make just one gallon of bottled water? That is such a waste, also the petroleum that it takes to make the bottles and transport them is bad for the environment...
Note for lurkers: magnesium isn't good for ALL kidney stones, just most of them. People who have a history of struvite stones for whatever reason, for instance, shouldn't use it. This is, BTW, the type of stone that cats get-- one reason that cats need a low magnesium diet for go...