Best way to transition 15 month old off night time bottle?

kachesle

We’ve successfully cut out all bottles for my 15mo except a bottle of milk before naptime and bedtime.  He loves these and we’re anticipating a rough time getting rid of them.  Curious how people did this and what they prioritized:  as intermediate steps, should we move to milk in sippy cups, so he gets the milk still, or do water in bottles so he gets the joy of sucking?  Or just go immediately to water in sippy cups and nothing else?