Matilda was pretty similar and we tried every different type of cup you could think of. We just gradually reduced her bottles to 1 small bottle in the morning and 1 250ml at night. Throughout the day she is offered water & after lunch/before nap time she's given a cup of milk which she will drink all of (around 150ml) she only sips throughout the day and maybe gets 50mls total, but our ECHN said keep persisting this way and she'll get there. We don't give her any fruit juice at all because we are trying to get her to drink water. HTH