L.Y.
How I switched my daughter from a bottle to the sippy cup is my putting away all the bottles. I gave her the option of a sippy cup and a small regular cup and she refused for the few first half day or so...but she gave in to the idea because her bottles were all out of sight. Make sure your significant other is also on the same page with you about the transition and remember not to give in. My daughter is now 21 months and has been drinking out of a regular cup and sippy cup like a pro.