Hi L.,
My little man was always a "straight from the tap" kind of guy and bottles were always a battle. Everytime he went on strike I'd freak out but he'd always eventually come back around and you learn their little "things". I.E. my son would only take a bottle from me when at home. Yes, me, the breastfeeding woman not the husband or grandma or auntie or neighbor. And, he liked it warmer then I'd expect but I run hot so it made sense. I spent a ton of money on different bottles and new nipples but it was always just persistance that won in the end. So keep at it and try not to get stressed or frustrated (if you are worried about him taking a bottle that stress is coming through and he's stressed that you are stressed...observant little things!).
On a last note when you are at work and he is at daycare or whatever, the enviroment is so different that what doesn't work at home may work well at daycare and visa versa. Just a reminder that it may not be a big deal in the end.
Good luck!
xoxo,
T.