I'm a little late on this, but thought I might add that if your lo is 10 mos. and doesn't want a bottle, take advantage of this and just get rid of it. Don't sweat it at this point. Try straw cups. You may think I'm crazy if you haven't already tried it, but most little ones can do straws at this age. My kids did it at 5 and 6 mos. I work with lo's with feeding disorders regularly and when I hear info like this I just say, move on. He's certainly old enough at this point. Any suspicions that he's having swallowing problems? The ability to coordinate sucking/breathing/swallowing for bottles is very complex. Straw give you much more control. If you don't have luck with straws right away, just plug one end of the straw and give him larger and larger amounts as you drop then into his mouth and let him put his lips around that end and he should eventually get the hang of it. I don't really recommend sippy cups, they really mimic drinking from a bottle.
HOpe this helps. I just happened to run across this message and thought I would reply, I very rarely check the boards at all anymore!!
Good luck and if you need more help, please ask!