Yes, you can take any food you want to take inside as long as it is in clear-ish bags, and unopened water bottles (or you can take an empty water container and refill them at bottle filling stations). When I go with my daughter, I take in 2 one liter bottles of water, a bag of peanuts and pistachios, some food (generally fried chicken), and some snacks for my daughter. As long as you put it all in an approved bag, you should have. I problem getting through security.