Generally, yes. Distilled water is normally the only water that is pure enough to use when making colloidal silver. Other types of water will work as long as they are very pure.
Mineral water, spring water, evian, etc., will not work because of the amount of mineral content and impurities in them. When making colloidal silver you don’t want anything in the water because whatever is in it will also become colloidal, potentially causing problems.
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