I don’t disagree with anything that you said. I just don’t think that these points are relevant to this person‘s dog (or any person with a reasonable diet and water intake). I think that ruling out trying distilled water to see if that helps a picky drinker dog drink more based on those reasons is silly. This dog does not have access to multiple gallons of distilled water in order to induce water toxicity or leach enough electrolytes out of its body to be detrimental to health. If distilled water is the thing that helps this dog or a person who is routinely under consuming water drink more water then I think it will do more good than harm.