https://www.netdoctor.co.uk/ate/childrenshealth/203080.html
https://www.babycentre.co.uk/baby/formula/boilingtapwaterexpert/
If you scroll down you'll see sub title water
This is from Food Standards
https://www.eatwell.gov.uk/agesandstages/baby/weaning/
I think you are fine to give tap water now, Paige has had it since 6months , unfortuantly its one of htose things that you get conflicting advice on xx