My theatre allows any food into it but Maccas, I had to sneak that in and let's just say, cheeseburgers don't taste the same when they've been down your bra
I have snuck in taco bell and beef jerky numerous times. I'm sure my seat neighbors didn't appreciate it but my theater blasts the vents anyways. Plus, the prices are outrageous to begin with. When I feel the need to be a healthier rebel I also sneak in grapes, carrot sticks, and sometimes even water in a reusable bottle *gasps*!!!
Open the soda bottle before you go in to relieve some of the pressure. That way it won't be as loud when you open it inside.
Go ahead and put Twizzlers down your pants if you want to but do it for fun, not out of fear