Pure H₂O is basically immortal. It’s been around since the dinosaurs.
So why slap an expiration date on a bottle? It’s not about the water. It’s about the bottle.
Yes, the real villain here is plastic. Over time, cheap plastic leaches chemicals into your drink.
The plastic monster underneath your sink
Most water bottles are made from PET plastic. It’s lightweight, cheap, and recyclable.
But leave it in a hot car for too long? That plastic starts to break down. It releases antimony and other fun-sounding compounds.
Antimony isn’t something you want in your morning chug. It’s a heavy metal. Yikes.
And then there’s the taste. Old water tastes stale. It’s flat, plasticky, and sad. That’s not expiration—that’s a flavor crime.
