Subject + 口渴 + 了
The adjective 口渴 (kǒukě) means "thirsty" and is the most common everyday way to express the feeling of needing a drink. It combines 口 (mouth) and 渴 (thirsty). Unlike 渴 alone, 口渴 is the standard form used in modern spoken Chinese.
我口渴了,附近有卖水的地方吗?
Wǒ kǒukě le, fùjìn yǒu mài shuǐ de dìfang ma?
I'm thirsty—is there a place nearby that sells water?
跑完步之后特别口渴,一口气喝了三杯水。
Pǎo wán bù zhīhòu tèbié kǒukě, yī kǒuqì hē le sān bēi shuǐ.
After running, I was especially thirsty and drank three glasses of water in one go.
你口渴的话,冰箱里有果汁。
Nǐ kǒukě de huà, bīngxiāng lǐ yǒu guǒzhī.
If you're thirsty, there's juice in the fridge.