How do you say no sugar in Turkish?

There are a couple of ways to say "no sugar" in Turkish, depending on the context:

Formal:

* Şekersiz: This is the most direct and formal way to say "no sugar."

* Şekersiz olsun lütfen: This is a polite way to say "Please make it no sugar."

Informal:

* Şekersiz, teşekkür ederim: This means "No sugar, thank you."

* Şeker koymayın lütfen: This is a polite way to say "Please don't put sugar in it."

For coffee:

* Sade kahve: This means "black coffee," implying no sugar.

You can choose the most appropriate phrase based on the situation and your level of formality.