Seriously, I don't think water- and food-borne deseases are something to be very vary of in Turkey. They have quite healthy tourist industry
Yes, and if your trip is in the cities where your water will come from municipal systems, then risk is lower.... ('course there are still all of those uncooked salad ingredients that came from who-knows-where to worry about!)
After enforcing pretty rigid food/water discipline on a few trips to Mexico and *still* getting sick, I experimented the last 2 trips with
Pepto-Bismol prophylaxis and purposefully ate/drank whatever appealed to me (including salads). The experiment was a success. So, at least when it comes to typical amoebic "traveller''s" diarrhea (as opposed to places where there is risk of nastier things like cholera/typhoid), this might be a cheap strategy to hedge your bets regardless of how disciplined your ultimate approach to eating and drinking.
I'd still be as careful as is practical (without taking the fun out of it) and remember Cummunicable Disease Rule Number One:
The safest thing to drink wherever you are in the world is BEER.