How to get baby to take bottle

My 2 month old is EBF. I hadn’t planned on using bottles as I’m a SAHM so can feed him whenever. However I would like to join the gym soon so invested in a breast pump so someone can feed him when I go.

We tried last night to get my son to take the expressed milk in bottle but he kept pushing it out of his mouth.

Should I try other bottles? Any tips on how to start getting him on the bottle? I’m also worried if he does have a feed from the bottle he will go off the breast?

Thanks