Honestly, both purified and alkaline water can work, pero purified is the safer choice para sa formula ng babies kasi it's been filtered ng impurities without removing minerals na needed nila, alkaline water pa lang has higher pH which some pediatricians say unnecessary pa for young kids. Better check with your pedia though para ma-confirm kung ano talaga best para sa baby mo, especially since bawat water source at formulation ng formula brands ay different, pero purified water is the standard recommendation na most moms use dito.