There is a small possibility that copper tubing was used during distillation process. Copper is toxic to the corals!. I would only use distilled water if I know the source or if I just have to use it. Few gallons should be O.K. though.
I used Distilled water at my office for my BioCube for a year, until I bought a RO/DI system. I have a RO/DI system at home, but I got tired of dragging around 5 gallon containers. Distilled water worked just fine.
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