My 21 month old is still...?

on the bottle. I KNOW its not ideal. I am an RDA (dental t) I know its bad, I brush his teeth 3 times a day. But I really need some tips from other mammas! I have tried to take it away cold turkey. The result was him making himself throw up and not to mention the tantrum from hell. I have given him water, but he loves water so it isn't about what is in it. I have scaled him back slowly oz per oz and nothing. He just wants to suckle himself to sleep. I don't want to introduce the pacifier, not to mention he won't take one. I can give him 1 oz and he is fine. But seriously any other ideas would help.