Have you visited the props board? (it's for babies but if you read through you may get some ideas)
If something is a prop then he has learnt that the way to sleep is with the bottle and that's the only way he knows how to do it. He wakes so often because when he goes between sleep cycles he rouses out of lighter sleep and needs the bottle to go back into a new sleep cycle. When he is in lighter sleep he wakes because he senses the bottle isn't there.
If there is milk in the bottle not only have you got the problem of the serious risk to his teeth but he's also taking in calories which he's accustomed to getting and he'll need to compensate somehow (if we always had a meal at night we'd be hungry for it too).
I'm not a bottlefeeder but I would first of all try and make sure that it's water in the bottle and not something that will damage his teeth or give him nighttime calories. If you are currently giving milk you could gradually water it down (perhaps while reducing the quantity at the same time so you don't end up with very full nappies) - so over a few days it gradually becomes more water and less milk.
Then you need to get him off the actual bottle (but at least with the comfort he won't be actually hungry) - it's the sucking technique that he probably associates with falling asleep. It's going to be really tough - I can't lie. Because of his age and the long association he needs to relearn how to fall asleep. Have you got someone who can support you because you may not want to do this alone. At his age you could probably go straight to walk in/walk out. So when he goes to sleep change the schedule around so the bottle happens before bathtime and teeth brushing. Then for falling asleep you need a new routine - a song you always sing, books to read, a special cuddle. Bottle is no where to be seen. Not falling asleep with the bottle the first time will help reduce other wakings. Then when he wakes don't have a bottle anywhere - go in and offer comfort and when he's calm, leave (perhaps with a phrase like 'sleep time now'). If he becomes upset and isn't settling - go back in and repeat the phrase but give the minimum of intervention.
You will have a really tough few nights I expect. But it will be worth it in the end. The important thing is that you are not abandoning him. With wi/wo you are there when he is upset and he can trust you are there.
Good Luck.
