I started offering one day feed from a lidded beaker when ds was around 9 months old. I offered it to him along with a snack and got him to feed it to himself rather than offer it the way I would with a bottle. Once he was used to taking milk in a beaker at that feed I did the same with the mid-afternoon one and he eventually ended up taking all his milk feeds from a cup by 10 1/2 months. He was also down to just 2 feeds by then.
Thank you for your replies. He has water from a cup with every meal, drinks at most, about 2oz. I did try with his mid morning milk today and he took some from it (although a lot he likes to spit out, like he does with water, the little treasure!). I think I'll keep trying with his mid-morning milk, which he isn't taking that much of now anyway tbh. Thanks again.