Quoting runningmom:" why do you want to give up the bottle?? that is most likely her comfort and I don't see why at 1 she ... [snip!] ... like she would breastfeed forever but thankfully weaned herself, your daughter is still so young, I wouldn't worry about it. "
2.5 is a little too pld for a bottle IMO. CNN Health says that you should start the transisition from the bottle at 6-9 months they also say that "It's an important step because prolonged use of the bottle can lead to tooth decay and nutritional deficiencies in young children. Waiting later can make it harder to make the transition, experts say. The pediatricians group recommends babies be weaned off the bottle and sippy cups by the time they are 1."
I took the bottles from my babies just after their 1st birthday. My son used a sippy or straw cup most of the time and didn't require a bottle to fall asleep with so he was really easy. My daughter was a little harder. I threw the bottle away and had to remind her that we didn't have any bottles anymore she would have to use a cup. It took 2 days and she was fine. My twins are 7 months old. I have introduced sippys and will take their bottles at 1.