I lovingly called my son a "boob-aholic". He loved to breastfeed and refused the bottle at daycare. I returned to work when he was 16 weeks old, and we tried every bottle out there. This refusal charade went on for 10 L O N G months. He would only eat when he really wanted to, and then wait for me. I was always petrified that he was going to get dehydrated, malnourished or just fussy for daycare. Bottom line is that he was fine then and is 2 years old now. He is healthy as a horse. :)
Don't stress out too much over this. If he doesn't take the bottle at daycare, he will get what he needs from you at home. Babies are too smart to let themselves starve, or not eat. If he is hungry, he will eat. Try a few different bottles/nipples to see which one work best. Get your husband or provider to experiment for you (you need to be in a different room or out of the house altogether so he does not sense your presence).
Good Luck and remember it will work out!! This baby stage passes so quickly and you will miss it. Hang in there and keep us posted.