HEY! I am also a college student and I am getting sleeve on May 23rd. I have been looking around my University cafeteria and have begun to realize how much of it I can eat. During my meeting with the nutritionist, she recommended to go to:
https://focus28diet.com/
There, they under the shakes section they have these chocolate ready to drink shakes. They come to your house with just the powder in them and you add 8 ounces of Water to it when your ready to have it. That makes it easy to store, you can take it with you to school and you don't need a cooler, they weigh nothing (since its just powder). I found them really useful.
Best of luck in your studies and with your surgery!