A.B.
When weaning from formula to whole milk, I first tried just straight milk to see if they'd go straight to it. If not, I gradually added more milk that formula each day. So like the first day, maybe 1-2 ounces of milk and then 1-2 more the next day until all they were drinking was milk. The sippy cup was introduced earlier with just water and they could have it when they wanted to try it, but then at about 1 year, I just took the bottles away completely and then if they wanted milk, they'd have to drink out of the sippy. Good luck and I'd only tackle one at a time, but it will only take you about a month or two.