Hi there,
Our baby took a bottle just fine the first few weeks of her life. One week, I got lazy and didn't pump, never imagining that going a week without the bottle would result in bottle refusal. It did. We tried everything...me leaving the house for hours, others offering it to her, different nipples, warming the milk, etc etc. I even got desperate once and took the advice of a nurse who said to put a little sugar water on the nipple to entice her to suck. Didn't work. The only two times we got her to take the bottle were, interestingly enough, when *I* gave it to her. I would start out with the breast and then slip it out and stick the bottle in...and would keep doing this...it worked...twice.
After trying to get her to take a bottle for over 3 months with no success, we decided to just wait it out until she was ready to use a cup. She is now 8.5 months old and although she isn't crazy about using a cup, she's starting to get the hang of it. At this point, I just put water in it or diluted juice because I'm holding out a few more months until she can begin whole milk.
It was a real battle for us (we called it the "battle of the bottle") and it was especially difficult for me because no bottle meant no help feeding her...it was all on me..every hour of the day and night. Luckily, I was not returning to work. However, I've known many babies who either don't take the bottle during day care or they cave in...I guess you'll just have to see how it goes.
Sorry I can't be more helpful in terms of offering specific suggestions; just thought I'd share our story!
Good luck!