Nutramigen - airport security

Hi everyone, I'm new to this so please bear with me. Was just looking for some advice from fellow mums. The last time I took a flight my baby was on SMA Gold and was able to use ready to use cartons but now he is on Nutramigen which is powder based only, so was just curious if anyone has had any problems when going through airport security because they advise that you don't make your bottles up in advance particularly with this milk and when I am out I just usually take my powder dispenser and cooled boiled water in a bottle and make up when needed but not sure that they will let you do this because I do not want to make it up too far in advance?Also does anybody know if they let you take through cooled boiled water in a cup for your baby to drink?