Hi,
When I first intro bottle to my son at 1 month old plus, he rejected too. I used about 2 weeks time to let him get used to bottle fed.
Dont stop direct latch.
Try using this method:-
1) Try slow flow teats and the similar teats to baby's pacifier (if baby is using it).
2) Let someone else bottle feed. If you are feeding your baby, higher chance of rejection because baby is smart to know you are direct latching him, not bottle feed.
3) Try feed with small amount first to let baby get used to it.
4) Put some breastmilk on the bottle's teats.
It is safe to drink collagen supplement and drinks, and it is a bosster to breastmilk (booster for me).