We've brought in lunch before too and had a picnic. We always bring drinks and snacks for during the day. I saw a guy once with one of those huge coolers on wheels, and the security guy just looked through it - told him he was only checking for alcohol. I wouldn't want to carry that size cooler around all day, but that pretty much tells you they don't care what you bring in (food-wise). I probably wouldn't bring in any glass containers either, but I have seen people with baby food jars - so not certain on there thoughts on that either.