This is most likely a dumb question.. But why does water get that old taste so quickly?

Is it just me, or does water get an old unrefreshing taste within like 10 minutes of just sitting in a glass or bottle? And does anyone else notice this? And if so do you hate the weird taste too? At the same tome, i just really don't like to drink water, so that could be part of the reason as well =/
That mess taste nasty!!
Nope stays fresh to me...
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This is most likely a dumb question.. But why does water get that old taste so quickly?
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