Well done Lisa, not worth taking a chance with your little ones health.
We were told in no uncertain terms by our baby doctor here in Fethiye not to give tap water to children and if we had any sense not to drink it ourselves.
It is safe to drink but long term use can lead to renal problems, that is why there are so many renal clinics here.
As with smoking, not everyone will get cancer and not everyone will get renal problems by drinking the water.
We do have Turkish friends who have had kidney stones and as TE says, very painfull.
Another thing to consider is the mains water is supplied on a high pressure system, when we get one of the many water cuts, bacteria can enter the system and you can end up very ill, this happened to us and other people in our area a few years back, we have not drank tap water at home since.