R.R.
The Nuby sippy cups that look like bottles are a great choice at first (no handles) and you can get them for $2 at Walmart. I let my daughter have her sippy all day as she was around the house and out and about so she got used to it. I also weaned from two bottles a day to only one at bedtime and just dropped the bedtime bottle gradually once she was really drinking from the sippy throughout the day.
Another thing I did was give her a special treat after dinner but closer to bedtime in place of the bottle for a few days so she would forget the bottle. Example, a few spoonfuls of sugarfree pudding or some dried fruit snacks.
Good luck!