There is (so/such) little water left that we are all thirsty.用哪个?为什么？

There is (so/such) little water left that we are all thirsty.用哪个?为什么？
There is (so/such) little water left that we are all thirsty.用哪个?
为什么？

There is (so/such) little water left that we are all thirsty.用哪个?为什么？
There is so little water left that we are all thirsty.
【so.that..】如此...以至于
固定词组
水太少了,以至于我们都很口渴
有不会的可以再问我

应该用so. 当little, few, much, many译成中文意思为“少”或“多”的时候只能用so来修饰，不可以用such. 但在下面的这句话中little译为“小”的意思， 就应该用such。你自己比较一下啊。
She is such a little girl that she can't write. 她那么小，不会写字。

用so There is (so) little water left that we are all thirsty.
so...that... 太...以至于...
传说中的固定词组