My kids didn't use bottles but they did use pacifiers and they were very, very attached. difficult child was especially and given all the other issues he was past 4 when I finally tackled it. I'm sorry to say that despite trying other things, the only thing that worked was going cold turkey. When it came to him and his sister, I planned ahead, made sure we were going to be home most of the time, and that their dad didn't have any night meetings so he could attend to the other children. Then I gave all of my attention to difficult child and let him fuss and fret plus I held and rocked him at bedtime until he was used to being without it . He did have a blankie and that became his lone comfort item from then on.
This is hard for any mother but cold turkey works on bottles and pacifiers if you make up your mind to be tough for the few days or weeks needed. This is your 5 year old with ADHD/ODD? It may make things worse during withdrawl but the other aspects such as social rejection and teeth damage are worth the effort on an issue like this, in my opinion.
