My wife has wondered for years about sports bottles and how easy it would be to do something like this. Turns out she was spot on.
I guess from now on when I haul my meal on board, since the airline won't feed me, I won't be able to bring on my own drink.
Ya think you'll still want to eat that tuna sammwich after 3 or 4 TSA folks have stuck their noses into it?
I'm going to guess that - if for no other reason than the economy of the airport concessions - passengers will be able to purchase "cleared" sodas, waters, toiletries, etc. once past the first tier of security.