Here’s the cool part: pure water (H₂O) doesn’t actually expire in the way milk or bread does. Water molecules are ancient—they’ve been around for millions of years, cycling through clouds, rivers, and your own body. So no, the water inside the bottle isn’t plotting to turn into something nasty on its own.
But wait—if it’s just water, why do bottles have those printed dates? That’s where the bottle enters the story, not the water itself. The plastic or glass container is the real character here, and it gets a little dramatic over time.
