Hello S.. I do sympathize with you. I had weined my youngest daughter from the bottle and my mom totally sabotaged it by giving her bottles when I was working. I was really upset with her.
Here is how I broke her again from the bottle. I went to the store and purchased a sippy cup with a nipple like top. It's called a NUK sippy cup. They only cost about 2 dollars and you can buy them at Wal-Mart. I would fill her sippy cup up and explained to her that bottles are for babies and if she wants milk, she could have it anytime, even bedtime! She didn't really like this at first. But I found that if I gave her milk in this sippy type bottle during the day, she became more and more okay with it at night.
Also, I didn't completely take away the bottle at night; at least not a first. The first week, I let her have the bottle, while letting her get used to the new sippy cup. The second week, I alternated the nights: Bottle one night, sippy cup the next. In the meantime, I told her that her baby dolls could use the empty bottles. She liked this idea! And sometimes, if she wanted, I would let her hold the empty bottle. By the third week, she had grown used to the new sippy cup and had adjusted to not having a bottle at all.
I did stick to the bottle only at night though. I would not budge on that. She is doing great now...she doesn't even ask for the bottle anymore. It took me about 3 weeks but I succeeded.
Good Luck to you!
Blessings, M.