Any toddlers still on bottle?

I feel like my son is the only one and I’m struggling to get him off! Any mommies have successful tips that helped? He refuses to drink milk out of anything but his bottle. He is still on whole milk and normally gets a bottle after day care. He doesn’t use a bottle but will drink milk out of a sippy cup at school 2x a day & water and he’s there for 9 hours a day, after school around 6pm he will ask for a bottle then again one for 10 (bed time) and 3am if he needs one in the middle of the night which never happens often. I’ve heard some moms watering bottles with water to help!?