Food in Turkey: Drink only bottled water while in Turkey. Though tap water can be drunk, even the Turks drink only bottled water.
To experience real Turkish food, find restaurants off the main tourist areas. Find restaurants where food and prices are local. Try Raki while eating mezze, small appetizers. Keep track of what you ordered and notice the prices so you will han no surprise when you get the bill. Eat in tiny places, fancy restaurants and huge places - the food is superb!