Switching from bottle to cup for milk

Any recommendations? My boy is one and we’ve switched to whole milk no problem. I’ve been told that we should move away from using his bottles.

In the daytime he uses a straw cup and a munchkin 360 cup for his water and he likes them, but he only has short sips when he drinks water. When he has milk in the morning/night he doesn’t seem keen on using anything apart from his MAM bottle.

We’ve tried milk in a munchkin cup (took a few little sips but wasn’t interested. Swapped to his bottle and he guzzled it). Have also tried a MAM hard spout cup but he wasn’t happy about that either.