I got the best Christmas present ever. A great water bottle that shows exactly how much I should be drinking (I never drink enough water). Over a month later and I'm still using it (which is more than can be said for most presents I receive). It holds enough for 4 hours of water. I usually fill it 3 times a day.
I'd have no issue taking this through security and then filling it airside. Then use it on the plane rather than drink the rubbish stuff they give out free.
