I understand that water is essentially the universal solvent - more compounds will dissolve in water than in any other liquid (there are probably chemists on this forum who will blast away at this statement and further edify us).

What I do is fill canteens with plain old tap water and throw them in my vehicle (and other locations), where they remain for some months until consumed. They are generally in the dark. I have done this for years, if not decades, with no ill effects.

Are there reports of anyone suffering ill effects from consuming water that met USCG standards? I suspect that in the usual emergency you would be in much worse shape if you did not consume the water, even if some chemical had leached into it.