@powercropper yes, there is a 3 quart instant pot as well
@powercropper there is an instant Pot mini which is 3 quarts. I sent one to my junior who lives in an apartment off campus and he loves it! It’s great for whipping up fast meals
In the instant pot you can do most of the things mentioned above - only one pot mess. Eggs, rice, soups, browning ground beef or chicken for tacos, brown meat like roast/chicken/pork chops and then add rice, potatoes, veggies for a full cooked meal. You can slow cook in it too. Make yogurt for breakfast, overnight oats, etc.
Here’s a small instant pot.
https://www.amazon.com/Instant-Pot-Programmable-Pressure-Steamer/dp/B071FGTXDW/ref=sr_1_1?keywords=small+instant+pot&qid=1553104002&s=gateway&sr=8-1
I have a small air fryer which I think is really handy
https://www.target.com/p/philips-analog-2-75qt-airfryer-hd9220-29/-/A-53760814
I can bread chicken breasts, they cook pretty fast, I have frozen French fries which I like in the air fryer.
I’m not sure why they didn’t link
I would suggest some tupperware containers. He may not have time to shop everyday, which looks like may be necessary considering fridge capacity. Even the smallest Instant pot he can do some rice & 2 chicken breasts. That will be enough for two meals if he nukes some veggies.
-Cold cuts don’t take up alot of space.
-Canned soup
-Smoothies are a great thing to know how to do. But you may need more fridge capacity for that. This is a smoothie my S19 has every morning: (I use the Ninja Pro 1000 watt. 3 cup sizes and lids. Very space saving friendly.)
1 Banana
about 1/2-2/3 cup milk
1 large dollop of vanilla yogurt
1 scoop protein powder (vanilla)
2-3 slices frozen peaches
6-8 small triangles frozen pineapple
DS says the consistency is more like a drinkable yogurt. He doesn’t like the smoothies you get in shops b/c he says he wants more nutrition than what they sell. He doesn’t want the ice they add as filler.
Don’t forget to teach the method of blending hot soapy water for quickly/easily cleaning a blender! 
May I also suggest he practice some meals over the summer? He’s not going to want to try to learn a new recipe or appliance when he’s got a 10 pg paper and an exam staring him in the face. KWIM?
Another vote for Instapot. DD’s friend is in a touring theater company and does her cooking on the road in the instapot. She says its a lifesaver.
I’m sure your son knows this but he may be limited by the size of the small fridge in his room and the fact that items in a fraternity kitchen are considered “communal” property. In my experience, most students who want to cook for themselves (unless they live in an apartment set up for that) gradually rely on take-out/fast food - which ends up being more expensive and less nutritious than what they opted out of in the first place.
When my now DH was in college, he had the “luxury” of an off-campus apartment where he shared 1/4 of the fridge, but he had access to the small stove/oven and a microwave. My MIL was a canner, and she sent him down with 2 dozen pint jars of her home canned peaches, and 3 dozen jars of her home canned soups/stews. Shelf-stable, but home preserved, was a key so he could avoid having to shop so often. His cousin lived 5 minutes away, but commuted home on the weekends, so he’d and often stopped over on the way to campus, to drop off a “care package” including her home made pies, a loaf pan of lasagna, home casseroles, etc. She made terrific meatballs, and would freeze them, so he could take a few and easily make a sub, etc.
Left to his own, he would have probably just scrounged around for faculty function, or invited guest speaker leftovers. Or a slice of local pizza.
One of his roommates loved to make jello - they’d add a can of pineapple, sliced bananas, or some strawberries - as it was his way of convincing his mom that he’d at least gotten some fruit into his diet. This was the same kid who’d always take extra plastic forks/spoons/knives from school functions, and used paper plates and bowls, so they could avoid washing dishes/silverware.
Having cereal, granola bars, pancake mix, crackers, canned / foil packet tuna on hand are key, because kids inevitably will find days they are too swamped to cook.
This using the bedroom to cook in is incomprehensible when there is a kitchen.
When I was in college I hated the meal plan and cooked in my room with a limited budget. Tacos, BLT’s, spaghetti, egg salad sandwiches, tuna fish, hot dogs and pancakes were made frequently. Many communal kitchens are not kept clean and become unusable for the students who do cook hence why cooking happens in the dorm room.
My dd’s college doesn’t allow anything with heating elements in the dorms so microwaves only. Definitely not conducive to cooking.
That said, we “cooked” a bit when I was back in college - ramen noodles were a staple, as was soup, pasta, and eggs. Mostly we bought stuff to microwave.
Get him an InstantPot!! Seriously the best thing ever. There are so many wonderful Facebook groups for InstantPot beginners and for recipes!
Try some recipes for food in a mug – they’re usually pretty quick and have limited ingredients. Chocolate cake in a mug is great, although maybe not super healthy.
What about oatmeal? Could be hot or cold (overnight oats are popular right now).
If he has access to Sam’s nearby, the pre-made stuffed peppers are excellent. If he gets tired of leftovers, it’s easy to wrap peppers for freezer.
Ha! When I saw the title of this thread, my mind immediately went back to the mid-70’s when i was in school–pre-microwave oven days! Our stand-by was Kraft Mac&Cheese made in an old-fashioned popcorn popper (or, maybe a ‘hot pot’. Added a can of tuna and maybe a can of peas and the result was Gourmet Tuna Casserole! Hadn’t thought of that in years until seeing the title of the thread! Oh, my! How the times have changed!