How many bottles is your 1 year old having

My baby will be 1 year and 1 week old this Friday. They have their check up yesterday and their doctor said we should drop a bottle and go down to 3 bottles. There were having 6 - 8 oz bottles by every 4 hours. Today is the first day I went down to three bottles. They don't seem to need diaper changes as much and I'm worried they're not getting enough liquid. I know this is just a one and it will take a couple days for them to get used to it and to learn to drink more water. I am wondering if it's better to stay at 4 bottles. Their doctor said if they get more than 24 oz of milk a day they could become anemic. We are also working on transitioning off a bottle and onto sippy cup also not going well. If you do three bottles how far do you space them out?