Transitioning from bottle to sippy cup

How do i go about switching? I know it’s a little early, but i want to start the process because I’m sick of bottles. Plus, she uses them just for soothing, and i need to break her of that since she’s eating way too much. she drinks water out of a sippy cup already anyway. She just won’t drink formula out of one. I know it’s not that big of a deal yet, but I’m just trying to plan ahead. Thanks!