Breastfeeding and Using Bottles

So I possibly have gallstones I'm not gonna know for sure until next week at my stomach ultrasound but my grandmother asked if we could start trying to get my little girl to take bottles just in case I need to get my gallbladder removed so she can help me with feeding her and what not. We've tried a quite a few times at first she ate out of them for her daddy but after awhile she just refused. I didn't really want to use bottles because I enjoy actually breastfeeding her the bond is just like nothing I've ever experienced in my life and I love it. Is there any tips anyone has for trying to get her to take them we've tried a few different nipple types already and she still just won't take them? My grandmother is going to get a couple other kinds to try but I just want some advice because if I do really need help I want her to be able to get fed. I've let my grandmother watch her a few times but she couldn't get her to eat to we had to rush back every time. I just don't know how much pain I'm gonna be in if I get the surgery done and I want to be prepared for the worst just in case.