“I wouldn’t recommend drinking coffee or hot tea from the plane. It’s made with the potable water and those tanks are rarely cleaned out. None of the crew usually drink it. I had a passenger on one of my flights fill his water bottle up using the sink in the lavatory and I stressed to him that it wasn’t a good idea but he didn’t care.” More at Huffington Post.
Enjoy your next flight… On the same topic, all safety videos should be like the one above from Virgin America.