According to the rules, food isn't allowed. But the people who check bags let it slide with some leniency. We had some snacks and got through with an excuse of not having had breakfast (which was true though)
You can as you don't over do it or make it too obious, they allow snacks, just say you are on a special diet, but we found out do all day and but all you can eat every hour, adult only and it was worth it, you can your friend can always share and food every hour but the time starts when you check out
I brought in snacks in a lunch bag... And water. Maybe not Subway.
No food but you can bring water.
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