my daughter had a bottle until she was 2-- she was underweight so my husband thought it was a way to get more calories in her..
she gradually lost interest in the bottle.. she would cry for it occasionally- and I would give her a bottle.. but she would only drink an ounce or two.. she had her last bottle when she was 2 years and 1 month old.. we were out and her nap was late and she was too tired to eat lunch so she cried for a bottle and she had one..(but again she only drank an ounce or two)
My daughter still has a pacifier... she loves it.. it is her comfort-- but we got the paci to stya in her bed.. we used to have pacis downstairs.. but one day I hid them.. when she couldnt find them I asked her where they went and she said our dog ate them.. so that is the story the dog ate them..(the dog has been known to eat things she shouldnt..)
so you might try to just get rid of the bottles and see what happens..
or start putting milk in it.(instead of formula ) so that she might not like it as well.
dont worry she wont go to college with a bottle.. everyone has something bottle pacifier, blanket... bear...
it is really not a big deal..
I would however get rid of the formula -- that stuff is expensive..