introducing formula

My LO is 2 months old and currently exclusively Breastfed. I am trying to introduce formula to himself case I am unable to keep up my supply when I go back to work. Here is the issue, he hates formula. Like screams and cries and won't take it. It isn't a bottle because he will take my BM ina bottle. Sometimes I can get him to eat an ounce or two and other times nothing. Anyone have any ideas on how to get him to take a formula bottle?