What is the best water for newborns to drink milk powder? The nutritional needs of newborns are very high, and breast milk is the best choice. However, sometimes mothers cannot provide enough breast milk for their babies. At this time, milk powder is needed. But here comes the question, what kind of water should we use to prepare milk powder? This issue will be elaborated on from several aspects below. 1. Good quality drinking water. Good quality drinking water is one of the better choices. Its pH value should be between 6.5-8.5, its hardness should be low, and it should not contain too many minerals, harmful substances and fine particles.