I have heard of a nipple called "breastflow" that is supposed to closely imitate the let down of breastmilk, so you might want to try that. As far as getting out goes, I love being a member of MOMS Club. Look for your local chapter at www.momsclub.org
I've experienced what you're describing with both of my children. I just wasn't consistent enough in giving them a bottle (it's just easier to give them the boob instead of pumping) so they eventually wouldn't take the bottle any longer. So to fix it I had to become consistent again. What we did with my daughter was my husband (if it's me she would just want to nurse) would try to feed her an ounce of pumped milk in the morning when she would be the hungriest. She refused it, but he kept trying and we were consistent, which is key. It took a little over a week of him trying to give her the bottle every morning, and she gradually would start sucking a little, and now she'll take the bottle. I sometimes put juice in a bottle too, to make it yummy and motivating (but my daughter is a little older than yours). Now that she'll take a bottle I'll just continue to give her a bottle of water, juice, or milk a few times a week to keep her used to it. Try expressing a little milk from the bottle into her mouth so he realizes what's in it.
What worked for my son was we were on a road trip so he had to take the bottle. He refused it for several hours, but finally gave in and took the bottle after I first got him latched on to me, then slipped the bottle nipple in once he was already sucking. Every time he realized and pulled away, I would repeat it until he just accepted the bottle. After that road trip I made sure to feed him a bottle a few times a week to keep him used to it. Consistency really pays off. It can be tedious, but if you really want your baby to take a bottle, just keep trying on a regular basis. Only you can decide if it's worth the effort. I just got tired of feeling like I could never leave my children without completely coordinating around their feeding times and rushing back to nurse them.