What type of water do you use to make a bottle

8 years ago I only used sink water to mak my daughter's bottle. My son is almost 4 months old and my family is concerned that I'm using sink water instead of bottled water. My daughter never had issues, but my son is very gassy and has tummy troubles so I'm wondering if it's too harsh for him. My pediatrician has never mentioned the water I use so I'm confused. what has your pediatrician said about using water to make a bottle? What do you use and why? Is there something I should know about using either?

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