playtex baby bottles with drop liners is what I used for my breastfed boy. Target even has a pack of 3 different nipples so you can try each one and see which one baby likes!
@zoeylush, they are a little pricey but once you have them they are yours for all babies in tour future. I love that brand because it's easy to clean and not a lot of small parts and my son never had nipple confusion. if you are worried about nipple confusion then the Philips Advent bottles are natural and similar to you.