bottle for breastfeeding baby at 3 months

My daughter is 3 months old and till now she is exclusively  bf. I want to continue breastfeeding but I also want to pump and give her milk in a bottle couple of times a day. Which bottle works best? Also how do I start giving bottle to a 3 month as she is so used to breastfeeding. Will it be hard to now make her feed from the bottle?  I want a bottle which will not create any nipple confusion so I can still continue to breastfeed her.