A.G.
My son has 3 meals, usually no snacks and about 5/6oz bottles per day. I think you are supposed to aim for between 24 and 32 oz until the age of one. It sounds like he is getting that. If he doesn't have a bottle right after lunch or dinner though, I might let him play with a sippy or straw cup of water just to help get that food moving and also so he get the feel of it - granted you don't want him to drink a lot of water and not want his bottle later.