This is my first time ever travelling. I will be travelling from Toronto to Aruba with a small child and I feel the need to bring some of my child's own food, since she is a picky eater.

Can I bring cereal, popcorn, and chocolate on the plain and into the hotel room? I will be staying at the Divi Villiage Golf and Beach Resort and travelling through Delta Airlines. Can I bring coffee as well? If so, do I put everything into a see through ziplock bag? If so, do I put it in my carry on luggage or my other luggage bag?