A.H.
My daughter also had a hard time transitioning away from the bottle. We just kept offering her the sippy until she drank from it. It helped to try getting rid of the breakfast bottle first, because that's when she was the hungriest and most willing to eat/drink anything. Once she started taking a sippy at breakfast, we offered it at lunch and dinner too. Once she was taking it with all her meals, we ditched the bottle all together.
Both of my kids love the Nuby bottles with the soft spouts.