Here's a practical suggestion: bake crackers. Buying gluten-free crackers can get annoyingly expensive, but it's not hard to bake your own, and they come with the following benefits:

1. They're easy to bake in large amounts if you stock up on gluten-free flours like almond meal or rice flour (which will also save money in the long run)
2. They won't go bad if you don't eat them within a day or two, so you don't have to worry about packing the right amount every day.
3. Similarly, they won't go bad in the mail, so your parents might be able to do the baking for you if you're pressed for time.
4. They're pretty close to the comfort foods I'm sure you're missing.

Easy recipe: Preheat oven to 350.

Mix together about 2 cups of different gluten-free flours.

Add some savory stuff like parsley flakes or sesame seeds if you want.

Add a tablespoon of oil and a couple tablespoons of water, and mix together.

(Add more water and oil if you can't get it all wet - some flours are drier than others.)

Roll the mixture out flat between two layers of parchment paper.

Remove the top layer of paper and score the dough into cracker shapes (I do a simple grid with the blunt side of a butter knife).

Bake on a cookie sheet in the oven for ~10 minutes. (You're looking for them to turn golden-y.)

Hope that helps!