Best sippy / straw cup for 1 year old??


I'm trying to avoid the sippy since I read it's bad for their oral development. I have been using the munchkin straw and the ezpz since 6 months and does fine with it BUT will only drink water in them. She will not take her formula at all other than a bottle. I'm starting to wean off formula today since she will be 1 next week. I want to throw away the bottles. I thought about elk and friends and pura kiki . Trying to stay away from plastic as well. Any tips on weaning from the bottle??