S.H.
They don't like drinking milk from a 'cup' because, milk comes from a 'nipple.' It is instinct.
Just try again later.
My son was like that.
They grow out of it.
My son would however drink other liquids out of other cups or straw cups.
You NEED to give, WHOLE milk. Because, the 'milk fats' in it is an important and crucial 'nutrient' for brain development, and for growth. And whole milk is recommended until 2 years old.
There is no need, to take away the bottles. Yet.
Do NOT add sugar to it or any sweeteners. Otherwise, that will be a LONG bad habit.
all the best,
Susan