Definitely Do Not Accept A Coffee
Many flight attendants wouldn’t suggest drinking the coffee or tea served on flights. While the potable water is filtered and not necessarily the same water that flows through the lavatories, you still might want to pass on these hot beverages that are made in flight.
The tanks that the potable water is kept in apparently don’t get cleaned as often as you’d think. And sometimes, the valve for the lavatory water is located precariously close to the valve for the clean water. So next time, you might just want to stick to the bottled and canned drinks.