You’ll be fine using tap water. The general rule is if it’s safe to brush your teeth with, it’s safe to use for sterilising with milton. X
I used bottle water for sterilising too with Milton. And boiled bottle water to wash them in the sink with fairy liquid. I wouldn’t risk any upset tummies x
It depends where u go..but, in general, tap water in Sardinia is not good to drink so i suppose you’ll need to use bottle water. (Most of the time they store water in tanks..) xx
I was told to use bottle water to wash bottles too, I go Spain soon with a 5 m old x