(1)drinking water n. 饮用水 (英语解释：Drinking water is water which it is safe to drink.）

（drinking water 为名词短语，drinking 为动名词作定语，用来说明后面名词的用途和功能。定语+名词）

Since 1908, chlorine has been added to drinking water.  

自1908年以来氯就被添加进饮用水当中。

The villagers piped in drinking water from the reservoir.  

村民用管道从水库引来饮用水。

We are running low on drinking water.  

我们的饮用水不多了。

The drinking water has become contaminated with lead.  

饮用水被铅污染了。

(2)drink water为动词短语（drink water为动词+宾语）

Instead of tea or coffee, drink water to quench your thirst.  

渴了喝水，别喝茶或咖啡。

Of all the things we eat and drink, water is the most important.  

在我们所有的食物和饮料中, 水是最重要的.

Drink water from your own cistern, running water from your own well.  

你要喝自己池中的水, 饮自己井里的活水.

He got thirsty and went to the riverside to drink water.  

他觉得很渴,到河边去喝水.