M.S.
I these same questions a few months ago with traveling my daughter. I called TSA and they told me that I can bring bottled breast milk and they can not make you throw it away, dump it out, or taste it to prove that it is milk. As for formula, I was instructed that I could not bring nursey water in bottles but I had to buy a bottle of water once I got through security. I would suggest to buy the water ASAP once past security becasue it is cold and usually baby's won't take colf formula but room temperature they might. I hope this helps! Call TSA if you have anymore questions.