D..
You shouldn't use regular milk yet - he's not close to a year, if I am reading this right. Please use a little formula - it won't hurt to buy some. Warm it so that it will be like breastmilk temperature-wise. Replace one feeding a day so that your breasts get used to. When he get close to a year, drop another feeding, making so that morning and night are the last ones. Then drop to just one of them. Once you get down to one feeding, put cabbage leaves in your bra and replace them when they get wilted - the chemical in the cabbage reacts with your sweat and breastmilk to help you dry up your milk. (This comes directly from the lactation specialist at the hospital.) Drink less fluids when you are trying to wean.
If baby wants your breasts, tell him that you have boo-boos on mommy (you can even use bandaids on your nipples.) Make sure he's getting enough calcium, even if you have to give him vitamins for it. Try not to give him juice at all until he is drinking formula or milk out of a cup. That will help him understand that he cannot turn his nose up at the milk vs juice.
All the while you are dropping feedings and getting him to take the cup, make the temperature of what's in the cup cooler. It's a process.
Dawn