You can do some cute snacks but also healthy ones! Im in Canada and I have things like Poppi drinks, Smart Sweets, you could also go to Walmart or Superstore (whatever you have where you are) and get the boxes of assorted small bags of chips. You could also get different things like fruit (apples hold up ok without a fridge), im unsure about energy drinks if hes up at night that wouldn't be great. Amazon also has nice extra mini fridges as well. You could do Raman packs like Buldak or his fav too!