>>157226Boiling and chlorine don't remove heavy metals and chemicals that may be in the water, nor will they remove the taste.
On that topic, you can greatly improve the taste of water, and remove some chemicals, by putting a simple piece of coal in your bottle that you keep permanently, the best one for that being japanese binchotan coal. It can be pretty expensive, it's kind of a novelty item now, sticks are sold separately in fancy plastic boxes, and a single stick can cost as much as $10. But you can still find some that you only have to pay $5 for a 2.5kg bag.
If you want to clean it, just boil it for a few minutes, but then make sure to throw the water afterwards, as it will contain everything the piece of coal previously held.
