Only drink bottled water
Drink bottled spring water and not tap water, tap water in Turkey is full of minerals and most people’s stomack is not able to work with it. You could end up getting the Turkey trotts. A roadside cesme (fountain or spring) may say the word icilmez which means not to be drunk or icilebilir which means it can be drunk but i would avoid this unless you know for certain where the source of the spring originates from. Please check the bottles have not had the seal broken, if it has then leave well alone, chances are they have been filled with tap water.