system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why shouldn't I drink water in Mexico?
gpt
Mexico doesn't have the same quality control on water that most other countries have.  Because of this, their water often has little "bugs" living in it that will upset your stomach.  When you drink water or eat foods containing these "bugs" your body cannot process them right because your body isn't used to them.  Your body tries to deal with this causing you to throw it up or by pooping a lot.