I was told to boil the water for 1 min then let it cool. I make a gallon at a time and use old Arizona tea jugs. I mix 20oz of formula a day and just pour in to bottles and warm as I need it. He also gets 10oz of pumped breast milk for breakfast (in 2 separate servings).
@quansmommyy, what I use too. it says on the bottle it isn't sterilized. boiling it has helped with the throw up tremendously