When we went to QLD in March they checked our bags before we went into Movie World but not Dreamworld or Sea World.

I packed a snap lock bag for each of us with fruit, snacks and a couple of sandwiches in and put them down the bottom of everyone's bag under all the stuff, they didn't even see it. I don't know how throroughly they will check now. But I was under the impression that NO food was allowed into the theme parks ever. We didn't take drinks, we bought those there.