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The lead crises in Flint, Michigan, and Newark, New Jersey, an alarming national water study in Canada, and the 2023 discovery of forever chemicals (PFAS) in nearly half of US drinking-water sources have all called into question the safety of North American public water supplies, which had long been considered among the best and most tightly regulated on earth

The optimal ratios between components for different applications have not been scientifically established through controlled studies

For unopened: keep them sealed in their original packaging and place them in the main compartment of the refrigerator, never in the door or freezer

That means the practical answer to how long is bac water good for after opening is usually up to 28 days, provided the original expiration date has not arrived earlier and the vial still meets visual and handling checks