The CDC advises to boil all water when preparing formula. It eliminates bacteria in the formula

Hi Sara! If you do heat the water before, just be sure that it cools before feeding to ensure baby's safety. As for distilled vs tap, it ultimately depends on the quality of your water. If you are unsure about the safety of your water source, consult your baby’s doctor or local health department. ❤️

I use previously boiled water only (store in glass).

My pediatrician said only needs to be boiled if a pre-me. But any nursery /distilled water is safe