I also received my reply from DLR Accessibility Services, but was told that I could bring in my own bottles of water. (It has to be a specific brand, since other brands can cause reactions and reflux, and I don't know ahead what brands are for sale inside the ACC.) Since I'm not looking forward to battling this out with the ACC security staff, I have asked for further instructions on what to do if/when my food and bottles of water are confiscated. Last Expo, the ACC bag check lead told me right in front of the D23 leads that he didn't care that the guidelines allowed me to bring in food and drink for medical needs. HE didn't allow it, so HE was going to throw the things away. So he did. And the D23 team just shrugged and said they couldn't stop it.