HELP!!!

So my 3 month old is exclusively breastfeed and I'm a few months I'll be return back to work, now the problem is he won't take any bottles(tried lots of different brands) and I also want to start weaning him off breastmilk but won't take formula either!!! I've tried a lot of different tips and tricks and all he does is play with the bottles nipple!! Please help!!! Btw I been trying once a day mostly during the least interest feed to get him on the bottle for the past week and nothing works, he'll take an oz of formula here and there but that's about it!!!!