By Mirage48291584, sauce

Every doctor recommends you drinking an adequate amount of water. So, it is no doubt that (insert brand name) water bottles are recmmemded by doctors. (That’s how toothpaste got dentist recommendation)

Also, why do doctor or nurse loves asking you to drink water? Well, drinking water can help you to recover faster, in term of general illness. And it was difficult to get water toxicity, so this advise is harmless to say.

(And the parents always expect the doctor and nurse to say this advice, so they can force their child to drink more water. This is the main reason why they say this advice to the parents und their children. [personal option])