I'm thinking demineralized water, of which distillation is several ways to produce it. The rub seems to be that it leeches minerals from both the body and distribution mechanisms (like metal piping)
Distillation isn't magic. It works because different materials have different boiling points. When it's salt and water it's really easy since the boiling points are totally different but when it's something like this we're talking about hundreds to thousands of possible compounds all in the same mixture (also, there might be different compounds each time because of the different materials), melted up together. I doubt it's purified.
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