I live in Tempe, az and I am supplementing DS with formula. At our 1st ped appointment they had a nutritionist stop in who recommended bottled water and not using tap water as you couldn’t ensure it’s quality. Well, tonight my MIL was holding him and turned on the faucet and started dripping tap water in his mouth. I said I would prefer it not with the tap water and she seemed offended. She is also a nutritionist and said that’s where babies get their fluoride and other minerals from. Just wondering other people’s opinions, and I am going to check with my ped at appointment next week.