What kind of water do I use to mix baby formula?

we have used distilled water with all 3 baby’s and never have had any issues at all!

The box/tub of formula should say. Mine says boiled, then cooled water. We have no issues with boiling filtered tap.

I use distilled water

I use Poland spring

I used distilled water with my son.

We always used distilled because we didn't want to risk pfas in the water.

Distilled

Normal water that’s cool boiled. Other water contains salts which could be harmful for baby.