[veave]

Do I really need to specify "unless you have put the bottles in the sun, which the label tells you not to do"?

[throwbadubadu]

Which is sometimes unavoidable, but to be precise, the same even on hot days without direct sun exposure, lets stop pea counting. You will easily find studies that stuff from PET production like acetaldehyde goes into the beverage and impacts taste.

But certainly also kind of what you are used to, always surprising for some folks to learn that for others chlorine water is associated with freshness, while clean water is a bit foul.