I have never heard of taking a baby less than a year old off the bottle, although adding a sippy cup and encouraging them to drink from it is common. Babies need the nutrition they get from formula. At 11 months we usually started adding 2oz milk to the formula for about a week then half and half then 6 oz to 2 oz formula. So by 12-12 1/2 months they were on regular milk. I can tell you in all the years in the baby room in child care that if you don't mix it like that and go cold turkey straight to milk it can make you puke when you change their diapers. Their little systems can't handle it. It needs to be gradual.
I agree that they should be eating table food at this age but I will tell you I have THE PICKY EATER! I think she would win any prize at it. And she WILL go days without eating if we don't offer her choices from food she likes. I know, we have tested it at school and at home. She will not eat if she doesn't want it.
So now that said. Children this age still need 24 oz's of milk daily so you you will just be switching from washing bottles to washing tippy cups. If you truely want to stop washing bottles and start washing multiple tippy cups and valves instead...LOL. I hate to wash valves because of having to scrub the insides with a stiff toothbrush every time. We also soak the valves in bleach water while we are waiting on enough dishes to run the dishwasher.
Here's my favorite baby and kid website.
http://www.babycenter.com
http://www.babycenter.com/baby