是a lot of water，意思是很多水，例如：

1. Do you drink a lot of water every day 每天你喝许多水吗？2.I have a lot of water everyday.每天我都喝许多水。

3.I had some medicines and drank a lot of water.我吃了些药，喝了许多水。

4. A lot of water. For 13 years, I haven't seen this high.很多水。

13年来，我没见过这么高的水位。

许多水的表达是a lot of water, much water或者plenty of water，但是不能用many water，因为water是不可数名词，而many只能修饰可数名词，后面加可数名词复数，much只能修饰不可数名词，a lot of＝lots of＝plenty of都表示许多的意思，后面加可数名词复数或者不可数名词。