如果 I drink ...water~應該用the定a呢

water基本上是不可數的東西，所以有會出現i drink a water的。
a cup/glass of water的a/the是指那件裝水的容器的。

the是用於某獨特指出的

如果寫成
I drink the water...
意思是想說出某(處/種)獨特的水
所以必須在water後附加說明
I drink the water from that natural spring.
I drink the water the villager offers me.
I drink the water from the well.

I drink water or I drink some water. Never use a water as water is uncountable noun.

We can say.

I drank some water at the party before I left.

I drink a glass of water.

I drink the water from the spring.= the water from = to tell where water comes from.

"water" is an uncountable noun, so you cannot put an indefinite article ("a" or "an") in front of it.

To say "a water" is absolutely wrong even in spoken English.

I drink water. (there is no need to use any article in this sentence)

However, you can use "the" to specify some more information about the water.
For example: I often drink the water from the tap.

兩者皆可
drink a water 大致上等於 drink a cup of water ->較口語化
經常會係對話中用到 但係文章中除非故事形式 否則唔會用到
例如 I briefly drank a water at the wedding party and left in a hurry.
婚宴上，我很快地喝了一杯水，然後便匆忙地離去。

**有時drink a water亦會指飲左一杯酒 -> 對亞洲人黎講係比較高階既口語用法，但一般係唔會咁用既，講既時候會用輕鬆隨意既口吻，否則唔自然

drink the water當中 "the" 發揮一個特定既作用
"the" = 指定既水
例如 I drank the water (he gave me). -> 我飲左佢比我個杯水
個"the" 係特定指向佢比我個杯 而唔係隨便既一杯水