thereissomewater是对的；
由于water是不可数名词，所以只能是there is some water，与some无关。
例句
There is some water in the glass.
杯子里有一些水。
There is some water in the bottle.
瓶子里还有一些水。
There is some water in the bottle.
水不是一个，为什么是is不是are?。
There is some water.
这里有点水。
I think there is some water in the bottle.
我认为瓶子里有些水。
