refrigerator drinks

Blake has been a milk addict since he was little.  He would prefer to drink milk like it was water.  He would ask often to have a glass of milk.  I noticed that he would not always finish his milk so I would put the cup in the refrigerator and save it.  That way when he asked me an hour later for milk I could tell him that it was in the fridge.  He liked the convenience of not having to ask for help in getting a drink and started storing it in the fridge himself.  He even started storing cups of water in the fridge, when he can easily get some from the water dispenser on the fridge. Lately he has been storing multiple cups in the fridge.  We will  open up fridge and he has several cups of drink.