Through the process of boiling water and condensing its steam into a clean container you get distilled water.
There is a debate about whether distilled water is safe to drink. The answer is: usually. The distilled water at the grocery store is fine to drink because it is made from drinking water (but because it doesn't contain minerals such as calcium, magnesium, and iron, it's not the best choice for consistent hydration), but if you were to take water from an industrial source, it would be unsafe to drink distilled because it may contain impurities.
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