Why do you want to drop to 3 bottles if it isn't to reduce milk intake? We still have a 4-a-day sort of structure to our routine for milk, dd2 is almost 2. Perhaps rather than drop to 3 bottles that coincide with meals, why not stagger the meals and milkfeeds, so that the milkfeeds are set to become snacks between the meals? Like this (2 nap strategy):
7am milk
7.30am breakfast
10am nap
11.30am milk (becomes mid-morning snack at slightly earlier time)
12.30pm lunch
2.30pm nap
4pm milk (becomes mid-afternoon snack at slightly earlier time)
5pm tea
6.30pm milk
bed
Just a thought?
Ax