At least in the States, you can buy a nice liter bottle of water post security. It's hard to stay hydrated on back to back intercontinental flights going through Europe. At least through Amsterdam, because of the gate side checks, I can't even bring any water with me onto the plane. I would love to be able to pick up a liter of water in Amsterdam to bring with me on the plane before my next nine hour flight after traveling + hours overnight. I cannot stay hydrated on those tiny half cup servings of water I get maybe every couple of hours.