Baby won't take bottle

My breastfed 12-week-old won't drink milk from a bottle. And it appears because he doesn't like the taste? But also it doesn't matter what we put in there, he hates it all the same.

Thawed milk. Fresh pumped milk. Never frozen milk. Formula. Warm. Cold. Warmer. He rejects it all.

He'll latch initially onto the bottle but the moment what's in there hits his tongue he grimaces and stops sucking. Then refuses to relatch. All he wants is that sweet titty milk straight from the teet.

Has anyone dealt with this before? Ideas?

I love him, but sometimes I need to be away for longer than the few hours between feeds.