Urine: Avent

7 Month Old Using Sippy Cup???

Hi Moms! My daughter is 7 months old and my doctor said she needs up to 2 oz of water/juice a day. However, I'm not supposed to put the water in a bottle and I can't get my daughter to drink out of a sippy cup. Any brilliant ideas? She uses the Avent bottles so we got her the Avent sippy cups but she just refuses to drink from them.