Ah the sticker student ...the one person in the flat more annoying than the food thief.
Someone is likely going to pinch a bit of butter or milk, most kitchens have lockable cupboards to store sundries so keep those locked away if you are seriously concerned. Don't start stickering you stuff because some dick head like me will think to themselves, "screw you buddy I'm spitting in your milk" just because.
The learning doesn't stop in the lecture hall, you will either grow stronger from your time at uni ...or run back home within a month, good luck.