Hi Rick.They all tend to sell Fanta orange and Fanta lemon,Coke and Diet Coke,Sprite,Iced tea and lots of different juices i.e Apple,Pineapple,Orange plus many more.
I have found that their own Turkish brands of fizzy drinks are just as nice and cheaper- works out at quite a lot over a week or two for a family if you are drinking it a lot in the heat. I like the orange and lemonade, is available in most of the shops and even cheaper in Tansas.
My youngest loves Suko(Zuko) which is a Turkish version of lemonade and is often served in Restaurants when you ask for Sprite, my eldest doesn't like it at all so always checks with the waiter when ordering Sprite that she will get Sprite else she switches to Fanta Orange, my wife also checks if she is drinking Gin & Sprite as she does not like it either.