The noun 茶水 (cháshuǐ) means "tea" or "tea water," referring to brewed tea as a beverage. It is slightly more colloquial than 茶 alone and often emphasizes the liquid itself rather than the tea leaves. It is commonly used in everyday and hospitality contexts.
服务员,请给我们倒一些茶水。
fúwùyuán, qǐng gěi wǒmen dào yīxiē cháshuǐ.
Waiter, please pour us some tea.
会议室里准备了茶水和点心。
huìyìshì lǐ zhǔnbèi le cháshuǐ hé diǎnxin.
Tea and refreshments have been prepared in the meeting room.
天气热,多喝点茶水解解渴。
tiānqì rè, duō hē diǎn cháshuǐ jiě jiě kě.
It's hot — drink more tea to quench your thirst.