You should never reboil water

You should never reboil water - We are all guilty of it. Putting the kettle on to boil water and then forgetting about it. The hot water cools down, and consequently, we boil the same water again. This is where we run into a dangerous scenario, something we might not have been warned about. The composition of water changes when boiled, which is typically a good thing as the volatile compounds evaporate and gases dissolve. This is why it's safe to drink boiled water..