Something to keep in mind with the Poster Tubes - getting a decent sized diameter one, not super tiny...but in the past some of the posters were thicker card stock paper, so rolling was harder.
Food is officially not OK unless you have a dietary need or a small child, but it really depends on the screener. I've seen people forced to dump sealed water bottles (so stupid). Generally I'm with everyone else, don't flaunt bringing stuff in but be prepared in case they say no. Usually I throw something safe (thanks food allergies AND a new chronic illness since 2019) into a small sandwich box. I'm planning to bring small reusable water bottle and refill as needed.
The "free" lanyards have gotten cheaper and cheaper. I usually bring my own even as a Sorcerer, this time around I'm rocking a Harveys (shocking, I know!) Monsters Inc. one.
The water thing makes me so mad, still. And I didn't have to dump mine.