Perhaps the afternoon bottle you can now switch to a solids snack with a drink of water in a cup instead of a bottle. Most LOs are down to 2 milks by this age, if you feel he needs the dairy it could be a yoghurt or cheese snack perhaps?
I found the mid morning and mid afternoon the easiest bottles to drop as it was just the switch to a solids snack which my DS was fine with and that was before 12 months.
At 12 months I dropped the BT bottle and at 13 months the WU bottle. It was the WU bottle that was hardest here. DS needed the milk, and he was very hungry, both of these factors mean that he needs to be able to drink it rapidly so of course the bottle was the easiest was to guzzle his milk. It took a couple of weeks of trying, I actually switched to a straw (wide one with the bendy bit) in a bottle first and initially he would refuse and cry so I'd quickly put the bottle teat on and let him have his guzzle. It helped here to snip the top off the teat (I didn't think back then if this was safe or not, I'm not 100% sure tbh, but it was for a very short time and I inspected the teat for 'bits', there seemed no choke hazard to me) so that he took the milk in an upright position on my knee rather than leaning/laying backwards in arms, this got him used to the sitting aspect. Then daily I tried the straw but having the bottle teat by me for back up. We also had practise at other meal times to use a straw to drink with. It did take perseverance on my part, trying it every day when I knew he'd reject it, but the daily trial made him more comfortable with it as time went on. I also *needed* him to keep his WU milk as my DS took so little milk anyway I couldn't let the amount drop which is why I wouldn't have gone cold turkey on that bottle.
So you could try a straw, or a colourful straw bottle might be more of an attraction?
I got a lovely couple of straw bottles for mine, he loved the colours and animals, but I found the straw impossible to fully clean so they didn't really work well for us in that sense. I used the bottle but with a disposable straw instead...and the used straws we washed out and kept for crafts at a later date (we have lots and still use them!).
hope this helps!
Just a mention about BT bottles, it needs to come before teeth brushing if you don't already do so. This was one of the reasons I dropped the BT bottle because we brushed teeth then gave the milk which wasn't good for his teeth.
