The sun is a giant nuclear reactor. It also disinfects water. Fill a clear plastic bottle and set it in direct sunlight for six hours.
The UV rays and heat do the dirty work. It’s called SODIS (Solar Water Disinfection). It’s the cheapest method on Earth. Billions of people use it.
Fun fact: you need a clear bottle. Green or blue bottles block the UV. It turns out bacteria don’t care about your aesthetic.
Distillation: The Overachiever
This is boiling’s fancy cousin. You boil water, catch the steam, and let it condense. The bacteria stay behind in the pot.
It removes everything. Not just bacteria, but also salt, heavy metals, and even some viruses. It’s the nuclear option.
The downside? It’s slow and uses a lot of energy. But you’ll have the purest water on the block. Show off a little.