I just returned in June from 20 days in Turkey. In the Antalya area, near Side and Manavgat, this is mainly German speaking. Very few speak fluent English. I spent most of my time in Istanbul where I had absolutely no problem with any food or drinks. I did drink other than bottled, but mostly bottled. The food was very similar to Greek types of cuisine. The spice market was very good for shopping of all kinds, much better than the larger outdoor market. The Bosphourus Cruise is very nice and convenient. I would caution to ask cost upfront of taxis, they have a tendency to take you long routes. The meter will also show if you are traveling in a certain rate time. I would always look at the meter.
I did not have any health concerns, although I did take a bad fall and injured my ankle. I would use caution when walking that surfaces are not even, and at any time you can step in a hole, or even a raised area suddenly.
There is so much to see in Istanbul that you can spend an easy week or even more, just in this city.
Pamakkale and Ephesus are also nice areas. You can purchase flights really cheap in Turkey(Atlas or Onur Airlines) and fly to Izmir and travel from there.
Turkey has alot of history and culture, and I would recommend it anytime.
The country is not advanced in many things. If needed, I would not use medical help anyplace but Istanbul or Ankara unless absolutely necessary.
I hope this helps, and I will tell you that I was a women traveling alone, so I really had to be aware of my surroundings and study up on these things.