By 2yrs he is probably already well attached to his bottle. If you want to get rid of the bottle then just keep giving him the milk in a cup, if he wants it he will eventually drink it, if he cries for the bottle you need to stay firm, best to throw bottle away so you cant be tempted to give in. explain to him that the bottles are for the little babies and he is a big boy now. It won;t really matter if he does not drink the milk, just give him dairy products to eat in the day, milk on cereal and he will be fine. I think at this age i just gave my son milk to drink in the evening.I think full fat milk until he is two if he is eating well.