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hmm glass bottles here have a metal cap, not a plastic one...also plastic bottles have plastic cap so it will also ruin the water but you have the full bottle too
as for metal, avoid alluminium, that drops it and you drink it
Did you thought about the inner layer of the metal cap? ;)
Next time I'll give a look, but I'm pretty sure I seen rust on a cap of a bottle I kept at home in the inner part
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