I flew with Mackenzie when she was a baby and she was bottle fed. I just put boiling water in the bottle when I left home and just before I got on the plane I added cold boiled water (which I had in a flask) to it and made up the bottle so it was OK when we took off. On landing I did the same on the plane. I found it safer to add the cooled water then the boiling expecially on a plane. I also found if you just had the boiling water you get use to how long it takes to cool down and you may be able to master it so you don't have to add any of the cold water - that is of course if you are bottle feeding. It's amazing how your mummy insticts just kick in and you will be suprised how you can improvise!