Weaning from bottle

What is everyone’s successful sippy cups/ transitional bottles for baby? My son turned 1 on Saturday and is obsessed with his bottle, so I want to cut it out sooner than later. He’s fine when it’s not nap time and drinks out of a sippy cup, but when it’s time to nap/go to bed he wants his bottle. I only give him water in the crib, but nothing is working.