having those additives would be extremely wasteful (potentially harmful) for all the things potable water is used for. residential agriculture, bathing, even for cooking.
And an excess of vitamins can cause serious intestinal issues, so depending how much you drink (during exercise or something) you may get too much too quickly and wind up with the shits.
perhaps most notably, the places that might need a baseline of vitamins would be the poorest areas, and this would be very expensive.
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