Mo ni ooru
Here's a breakdown:
* Mo - I
* ni - have
* ooru - thirst, hot (referring to the feeling of thirst)
You can also say:
Mo gbọ́gbọ́ - This literally means "I am dry", but it is commonly used to express thirst.
Mo fe omi - This means "I want water" and implies that you are thirsty.
Mo ńṣe ooru - This means "I am feeling hot" and can also be used to express thirst.
Note: The choice of which phrase to use may depend on the specific context and the level of formality.