almost done

Ta
So my baby is 2.5 months old.  I've been breastfeeding and topping up with formula as I don't produce enough (even with motillium and milk tea and fenugreek and lactation cookies).  So at the two month appointment his weight was no longer increasing and we have had to start doing more formula.  He would previously have 2 ounces every 3 hours or so after a breastfeed.  Now he's having 4-7 ounces after each breast feed with the exception of through the night when I seem to have more milk.   Any tips in how to transition to full bottle?? He HATES the bottle and it makes me feel so bad knowing he wants to be at the breast and I just can't provide.  So I'm looking to make this as easy a transition as possible. 
Thanks in advance