Hello. Bottle weaning milk can often be very challenging with toddlers. Since your child already knows how to use a silly cup, it is simply a matter of no longer giving him any bottles at all. He may go on a "milk-strike" as you described and that's okay. You can feed him yogurt and cheese as alternate dairy sources. To get him to drink milk, you can continue to deny him his juice until he has a cup of milk, even if he refuses to drink all day. No child will ever dehydrate themselves to any point of danger when the drink is available for him. Thirst is a powerful motivator so stand your ground and he will eventually give in. Good luck!