And your stool is still watery?
现在还在拉肚子吗？

Stool
大便，粪便

Stool is the medical term for poop.
Stool是大便的医学用语。

There are many terms for poop: "stool", "poo", "poop", and "shit". are the most common.
还有其他词可以表示大便。“stool” "poo" "poop"和"shit"都很常见。

Stool: you will most likely hear the term "stool" being used by your doctor, so you should really only use use the term "stool" when you talk with your doctor or in a professional setting.
Stool一词更有可能听医生说，所以专业场合中和医生交流时也只用“Stool”一词。

I guess you can say it is the "formal" word for poop.
也可以说stool是poop更正式的说法。

Poop and poo are basically the same, but "poop" is more common. Use it at home or with friends because it is a bit less formal than "stool".
Poop和Poo基本是一个意思，但Poop更常用。在家或和朋友一起使用，会比stool更日常。

Shit also means poop. This is an informal word for poop that should not be used in a setting like at work or school talking with higher-ups.

Shit也是Poop的意思。是poop更不正式的说法，在学校或者工作场合里与上司长辈讲话时不应使用。

I can't believe he shit his pants!
简直不敢相信他拉裤子了。

Shit can also be used as an exclamation of anger.
Shit也可以表达生气时的语气词。

Shit! I left my keys in the car!
**！我把钥匙落在车里了！

It would be okay if you use the word "shit" with close friends for these kinds of situations.
在这种场景下和近亲的朋友用这个词也没有问题。