You are still so early on post takedown so don't be concerned at all with difficulty holding right now. Yes, you do want to try to hold longer periods of time right now (as you can tolerate) instead of going every time you feel an urge. I remember my first month post take down getting the "I have to go right now!" feeling several times a day, but I would push through it and be able to hold for another hour or two. Then that feeling just went away one day.
Great news is that there are lots of bathrooms on a college campus! So you should be covered on a daily basis from that perspective. If you have a long class, such as a 4 hour lab, or you have an exam, you can always take Imodium beforehand to ensure that you'll make it through.
I don't think anyone can give you a ton of food suggestions yet as every person tolerates foods differently and you'll have to see through trial and error what works for you. In general, eating bulking type foods will thicken your stool (breads, cheese, meat) and eating food with insoluble fiber (fruits and veggies) will make things more watery. Not true for everyone, but the watery stuff can make you feel like you need to go more often.
I personally do not drink alcohol, but of course, many college students do. I would caution you there as alcoholic drinks tend to have a lot of sugar or carbs that can aggrevate your pouch. Someone else would be much better to provide advice regarding drinking with a pouch as I have little experience, but I do know for the few times I do have a drink or two, my pouch is not happy the next morning. I can definitely advise that if you do drink, make sure you take in lots of water as well. We pouchers do dehydrate easier.
Best of luck to you!! You'll do great :-)