When my mom and I flew to TX, she brought a carry on with her cans of liquid food and all of her liquid medicines. As long as the prescription bottles have your name on them, its okay. The ensure should probably be unopened when you go through security. We didnt even get questioned about her medicine. They gave me crap because i didnt take my laptop out of the bag but let the lady with a gallon of liquid medicine through, no questions!
enjoy your trip