Baby's Water

Why do people think babies need special water if they use formula? I had never heard of this before until recently when it seems like everyone thinks they should use special water to make formula.

I asked my pediatrician and they said it is NOT necessary unless you live somewhere with unsafe drinking water.

Is this marketing? Is it being overcautious about something?

What water do you use for your baby?

Moms Expertise
    My baby is breastfed, but she also gets sippy cups of water. She and her siblings all drink the water straight out of the tap.
    About Sabrina
    Birth: October 09
    On since: Feb 25, 2014