I've discovered a great snack to munch on in the movie theatre that is easy to buy (or make) and satisfying to eat. It's dehydrated fruit. I've always loved dried fruit, but never thought to take it to the movies. I love to dehydrate my own, but it never seems to last long. I've been buying the dried apples from Trader Joe's this past year (no sulphites and just a few dollars) and they're super yummy. They're called "New Zealand Sweet Apple Rings" if you need specifics. They're super chewy so they seem to last well for movie watching.
Granted, you're not really supposed to bring in your own food to the movie theatre, but unless they put something on their menu that I can eat or drink, I'll be bringing in at least my water bottle filled up and probably a little something else too.
Some other dried favorites are home dehydrated peaches, apricots, pears, or mangoes. I also love fruit leather, homemade or not. I have an abundance of ripening fruit so it's time to make fruit leather again. I'll experiment a bit and will post some recipes. They're basically smoothies flattened out.