system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we make water safe to drink? (Including removing the chemicals used make the water "clean")
gpt
Several ways:

Desalination: turn water into steam. Salt and dirt doesn't become steam. Steam is clean. Turn steam back into water. Water is clean and not salty.

Reverse osmosis: force water through a tiny screen. Dirt and germs are too big and stay behind.

Distillation: pretty much the same as desalination except you start with not-salty water. Minor differences that a 5 year old won't grasp.

Filtration: similar to reverse osmosis except use a can of charcoal and other stuff instead of a tiny screen. Minor differences that a 5 year old won't grasp.

Chemical treatment: kill the bad stuff by adding bad-stuff poison.

Boiling: kill the bad stuff by cooking it.