If you thought your trusty reusable water bottle was the pinnacle of health and eco-friendliness, brace yourself — it might be harboring a whole microscopic party you didn’t RSVP to. Yes, we’re talking about germs, mold, and all the other uninvited guests that love nothing more than a damp, dark home with a little leftover sip of yesterday's iced coffee.It turns out those bottles w...