Here is what we had to BUY after we got D to college last week. I should buy stock in Target!
Extra long extension cord. D's dorm had a micro/fridge but only two outlets on the far side of the room. H spent much time on creative power sharing.
A surge protector also with a long cord - see above. The one we had brought had such a short cord she couldn't charge her phone from her (lofted) bed - a big deal apparently...
Hair Dryer - didn't really forget - we only have one a home and she's not taking mine!
Ice cube trays for the micro/fridge

We also bought her several large bottles of water for the fridge. Temps were in the high 90s and no A/C so water and ice were very welcome!
Paper Cups (see above)
Trashcan for room.
More command strips for hanging stuff on walls. D has hooks for everything from necklaces, bags, belts, pictures and room key. Love command strips! Can't have too many.
The only thing we are going to buy her now is a wet swifter. Dorm has tile floors and we all agreed a little swifting now and then wouldn't hurt at all. No rush on that though as I'm sure it's not top on her list.