There isn't really an easy way if you want results soon!
He needs to learn how to fall asleep on his own all over again. I would have thought at 14mths he does still need a day time sleep but not late in the afternoon. Get into a new routine with him and stick with it every day. He needs a bedtime routine with bath, bottle/cup of milk and quiet time then putting down in his own room. He will scream at first but if you are firm and persist I bet after a day or two he will stop.
If you really can't bare to leave him crying, every time he cries cuddle him and reassure him but always put him back down when he stops. This will require a lot of time and effort but he will realise that bed time is for sleeping.
In the night when he wakes you will have to do the same thing. Don't bring him into your room.
Another idea as well could be to swap the bottle to a cup. He doesn't really need to suck from a bottle now and it may help wean him from falling asleep with you and make him feel more grown up.
Good luck!