M.R.
Honestly, starting later makes things harder--usually if you know you will need to offer bottles at all it is helpful to start within the first month or two, but not until nursing is established (between 3 and 4 weeks old) and it is often best to have someone other than mom offer the bottle. My husband started an evening bottle at 3 weeks with both kids and that worked well. Some babies also really prefer one type of bottle and nipple over another (my boys had to have the wide base for the nipple, like Avent). Breastfeeding is so good for your baby so it would be a shame for you to feel you need to stop. Not every baby will take a bottle, though, so you might have to get even more creative. Sometimes imitating with a bottle is harder for them and they actually will eat from a cup, medicine dropper, spoon, or small medicine cup. Most babies will eventually take a bottle, so keep trying. Have your husband try feeding him when he has half-nursed and is not starving or upset, open his shirt so he can get skin-to-skin contact to make it more soothing, and make sure that the breastmilk is lukewarm/body temperature. If you do not need bottles for you to go to work and it is only short periods of time, you at least have the option of nursing really really well and keeping your trips to three or four hours. In a few more months you can introduce a sippy cup and start some baby foods, which might make short time away a lot easier. Good luck.