Well I'm grateful at least for Kamelia asking this question
Although from the answers, I'm not still sure.
I have never (knowingly) drunk tap water in Turkey, always buying bottled water. However, I am trying very hard to move away from contributing to the plastic bottle mountain.
So some of you use the tap water, some use filters, some still buy bottled. As someone who is likely to be living out there for the majority of the year, I would be grateful for more responses if possible please. (Although I have to say Loz and GordonA seem to be in rude health, so I'm inclined to use the tap).