All beings need drink as much as they need food, and it is just as necessary to health as pure air; therefore the water should be boiled or filtered before being drank. Rain-water filtered is probably the best attainable. Boiling the water destroys the vegetable and animal matter, and leaves the mineral matter deposited on the bottom of the vessel containing it; therefore it leaves it clear from poisonous substances.
The White House Cookbook (1887).