Are you a Virgin Sodie or a Chad Water?!
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Water does expire. If you leave it exposed to the air shit will grow in it, and even if you have it in a container you shouldn't keep it for more than 6 months (or if you do, treat it with bleach before drinking it)
Stagnant water can also become a breeding ground for mosquitoes and other pests.
If it's bottled water, the plastic degrades.