Coke

As every schoolchild knows, the ingredients of Coca-Cola are one of the world’s best-kept secrets. In order to protect the mystique of The Real Thing, even subcontractors who bottle the stuff are kept in the dark, however their bottled water, Dasani, is The Real Thing. It is pure and simple tap water. To be fair to Coca-Cola, their water is cleaned as it is first passed through three filters intended to extract particles, organic debris and chlorine before a final reverse osmosis stage