Breastfeeding baby won’t accept a bottle

I have been exclusively breastfeeding since baby boy was born. For the last couple weeks I have been trying to get him to take a bottle in preparation for when I go back to work mid September. However baby boy won’t take the bottle, won’t even try to suck on the nipple. I’ve tried both Latex and silicon nipples, I’ve tried the Dr.Brown slow flow bottles and the Avent bottles but nothing! He also will not take a pacifier. Please help. I don’t want him starving during daycare or having a hard transition.