Most rec centers at college already have juice and smoothie bars like this and the students can use their meal plans then as opposed to spending cash. Something that has worked at my school is students make hot grilled sandwiches at a little stand between the student neighborhood and the dorms. They are only open from 12 am-3 am when everyone is returning home from bars and partying. They sell a ton of sandwiches, there is always a like of 10 people. They have a basic website
THE MONCHON . I think inebriated people are going to be the most likely to spend cash for food, especially when the food is conveniently located.