What breed of goat do you have? Small goats like Nigerian Dwarfs seem to do great on just cow milk from the store. In my experience Boers seem to do better on a homemade milk recipe or if you have someone that lives fairly close to you, buy goat milk from them and feed it to them.
Some people have success with the milk replacers but majority say that the homemade recipes cause less scouring.
You can look up the Coni Ross milk recipe, but it's a little more expensive to make. An easy one that lot's of people use is take a gallon of whole milk with 2 cups removed, 1 can evaporated milk and 1 cup of buttermilk. Mix it all together and feed 8 to 10 ounces 4 times a day, increase ounces at it gets older. You can google bottle baby goats and find examples of how much to feed at what age. It's usually so much percent of their weight a day but off hand I can't remember what it is. I'm sure someone can come on here and say.
Also they say soy based milk replacers are the worst for causing scours.