The problem is proteins. With multiple allergies finding proteins without sauces and breaking may pose a challenge. What options are there? A few
Go to a grocery to purchase cold cuts or beans(While Foods market has juice box containers that arête package kidney beans. And there's always can openers. )
Send foodstuff to your child. I am notorious for shipping 36 individual containers of Cheerios via Amazon). It's amazing what is now packages for individual use or in resealable packets. Olives! Black olives!
Get a micro fridge
That way your child can have some options. Oatmeal. Rice packets. Popcorn. A place to store food. Baked potatoinvestigate
Some times foods/proteins are there and one just has to find them. Kosher stations are often a good source for food allergic kids. Possibly vegan--but tofu and chickpeas are high on I greediest lists for that cuisine.
My point is dining hall experiences are not as srraightforward as restaurants can be. And yes it's a lot to add along with new friends and classes and living on ones own -- but that's life for our kids and we can help by being the support the springboard for them.