Can water get stale?

My query on the title may sound absurd to you...but in case you have not noticed, those branded water bottles sold on the supermarket (i.e. Aqua, Vit, etc.) does have an expiry date.

Gee, I am lost.

Why is there an expiry date on the bottle? I mean... I know I do not excel on Chemistry, but we only need to question the common sense here.

Why do they inscribe an expiry date on a water bottle, for heaven's sake?

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