M.F.
I started by giving juice and water in the sippy. Neither of mine were interested in the sippy cup until 11 months old. Once they got the hang of the cup I gradually replaced bottles with cups one at a time. I started with the mid-day bottles. I think the morning bottle was the last to go. I waited 3 or 4 days after dropping the first bottle before I dropped the second. After that, the last 2 were easy.