It’s common knowledge that you shouldn’t drink out of the water bottle that you left in a hot car. But how recently have you checked its expiration date? That’s right! Bottled water DOES expire. And while the reason why meat or dairy products have a sell-by date is pretty self-explanatory, you might be surprised that bottled water comes with a time stamp, too. As it turns out, it isn’t the water quality you should be worried about; it’s the plastic that the water comes packaged in (usually polyethylene terephthalate (PET) for retail bottles and high-density polyethylene (HDPE) for water cooler jugs). After a certain point…