K.D.
My daughter had a hard time taking a bottle, too. I found that if I gave her bottles away from our usual nursing spots and avoided having her in the same/similar position as nursing (such as lying on a boppy pillow facing me) she was more willing to try. Also, having someone else try giving her a bottle while you are not in the room (so she won't see, hear or smell you) may also help.
As for your husband and his family, I think it's sad, and frankly unacceptable, that they aren't supporting you. It doesn't matter how your baby is fed, just that she's loved and taken care of. If I were you and someone made a comment about my breastfeeding, I would say something like, "I made a choice to breastfeed. You don't have to like it, but I'd appreciate it if you'd keep your comments to yourself." They may not like it, but it's not fair to make you unhappy about your choice. As for your husband, I would sit down and talk to him (when his family isn't around) and explain now, more than ever, you really need his full support in taking care of the baby, and that includes exclusively breastfeeding, no matter his feeling on it. And you could explain the health benefits as well as financial. I bottle-fed my first baby (he was unable to nurse) and we spent over $2200 for formula in that first year - that's reason enough to breastfeed if you can. And if you can pump and get her to take bottles, then he won't feel left out of feeding her (if that's the issue).
Good luck! I hope things get better.