Question

Why can't distilled water be consumed?

Answer 1

Distilled water from other sources may not be safe to drink. For example, if you take nonpotable water from an industrial source and then distill it, the distilled water may still contain enough impurities that it remains unsafe for human consumption.

Another situation that could lead to impure distilled water results from using contaminated equipment. Contaminants could leach out of the glassware or tubing at any point of the distillation process, introducing unwanted chemicals.