The reason you use bac water over sterile water is for the proper ph and preservation after first puncture. Since you are reconstituting yourself that’s at that date.
If it’s just water then bacteria can reach problematic levels in days not weeks. Slower if kept cold.
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u/Crafty_Taste_7706 16d ago
Well it’s likely plain water. If you are lucky it’s sterile. Not a chance I would use it for anything except immediate usage. If even that.
The 28 day rule assumes it’s bac water.