Sippy cup or straw bottle

I tried sippy cup with my gal cos she always saw the family using cups. but she couldn't drink from it. I was shown by a friend how she used this training straw cup to get her daughter learning to drink from a straw. the cup on the right has a valve and when you press on the lid, water moves up the straw. I went to buy 1 and my gal learnt instantly. now she only drinks from a straw!