Here’s your cheat sheet:
If your tap water is safe (check with your local water authority), boil it for the first 3 months or if you’re paranoid. After that, cool tap water is totally fine.
If you’re on well water, test it or use bottled. Choose purified or low-mineral spring water. Don’t overthink it—your baby will still drink it even if you accidentally use Fiji water (but your wallet will cry).
And the real best water? The one that’s safe, sterile, and not giving you a headache. Your baby doesn’t care about the brand. They care about the milk. So relax, mix the bottle, and toast to your new tiny overlord. Cheers.