Why do bottles in supermarket have an expiry date? Do bottles ever expire as the mentor told me, that it is expiry date of bottle not water?

Why do bottles in supermarket have an expiry date? Do bottles ever exp

1.	Why do bottles in supermarket have an expiry date? Do bottles ever expire as the mentor told me, that it is expiry date of bottle not water?
Answer» Why do bottles in supermarket have an expiry date? Do bottles ever expire as the mentor told me, that it is expiry date of bottle not water?