Re: 12 month transition, still so confused...
Since your LO is just turning one, I think the best thing to do is to slowly drop the bottles. Maybe keep the number of bottles the same, but send a little less in them. Or drop a single bottle and then wait, see how it goes, then drop another, etc. you want to be careful about dropping those pump sessions, too- some moms can't drop 3 pumping sessions all at once without getting uncomfortable. So I'd drop one, give it a few days, then drop another.
When your LO is weaned from breastmilk bottles, then yes, it's going to be water all day! And while there's no need to offer cow's milk, provided that you nurse at least 3-5 times per day (more being preferable, especially with a young baby), you can give cow's milk bottles or sippies if you want.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"