We might be flying in the next couple of weeks with 5 month old DD. She's on Enfamil for reflux, which means I can't make up her milk in advance. I have to take bottles of cooled boiled water and milk powder. Has anyone taken this through airport security? I know you can take through baby milk, but I'm not sure about milk that's not been made up. I might take a doctor's note to explain, but just need to get through security.