So this last trip my husband was on one of those scooter chairs, he had a little basket in the front which meant we wouldn't have to haul anything in on our backs so he loaded up our Trader Joe's reusable shopping bag with about 4 plastic bottles of water, 3 plastic soda bottles, 10 bags of chips/kettle corn, 5 granola bars, his leftover sandwich and some chocolate bars. I thought he was really pushing it. We got to the security check and all that was said was 'okay just snacks in here', DH said yes and we were off to the entrance.
I remember 9 years ago we carefully hid a water bottle in the bottom of our diaper bag and thought we really got away with sneaking in some water....LOL, oh my how things have changed.
You are totally fine bringing in snacks/drinks