If you choose metal containers because you think plastic is bad, remember that all aluminum food and beverage cans have plastic liners which usually contain BPA or other endocrine disruptors.
https://www.fda.gov/food/food-additives-petitions/bisphenol-...
I hope you don't mind if I believe the FDA over a bunch of rumors spread by the same internet know-nothings that brought back measles.
BPA is not the end-all be-all of endocrine disruptors, of course: there are other classes of compounds banned in most of the developed world with solid evidence of harmful effects, like phthalates. It would be useful to check various established OECD health authorities and reputable research before dismissing the danger of endocrine disruptors as "rumors spread by know-nothings".
And if still true for water, hydrolysis will be slowed at a neutral pH.