for long-term storage, the better bet is to get distilled water, it las longer. Alternatively, if you do use tap water, add 4-5 drops of unsce liquid household chlorine bleach per gallon to keep it fresh.
FYI, you are not supposed to drink distilled water on any longer term basis.
Same with reverse osmosis (RO), as it filters out most minerals. Some RO filters have a stage for remineralization. You can buy mineral drops too.
BH
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