system
Given the following post, respond as if you're commenting on Reddit:
human
How does my stomach separate the liquid I drink from the digestive fluid?

I imagine the stomach is full of these acid and that these acids don't get into the intestine so how does it filter the water?
gpt
The stomach doesn't separate it.  Everything flows into the small intestine.  The first part of the small intestine is called the duodenum, and inside of it, the body secretes sodium bicarbonate to neutralize most of the acid.