Domino - I tired deropping just one feed a day initially but like yours, DS2 just held out.
It was only when I dropped two feeds that he was hungry enough to take it.
It makes me sound horrid to suggest cold turkey, but with my DS we tried everything.
I'd offered him a bottle of EBM every day for a month to no avail - all that precious EBM going down the drain!
I'd tried formula, juice, water. I tried getting various other people to give him a bottle. I went out for the morning and left DH to it, in case my being around was enough to make him hold out. I tried various sippy cups. I tried every bottle teat ever manufactured. i tried when he was very hungry. i treid when he wasn't hungry. I tried him wide awake, I tried him asleep (dream feed).
Nothing worked, and he had to take milk somehow, as I leave for work at 5.30 am so it was too early to do a morning feed.
Skipping two feeds was the only thing that worked.
It wasn't nearly as traumatic as I though. I kept him busy between feeds, we were out and about, and before I knew it he was taking it.
Good Luck