Taken together, Coca-Cola's beverages might come close:
>Today, products of The Coca-Cola Company are consumed at the rate of more than 1.8 billion drinks per day. [0]
However, it's hard to say how that translates to unique people, since it's not uncommon for people to drink more than one soda a day. Not to mention the fact that the product lineup is very diverse: you could have orange juice for breakfast (Minute Maid), water for lunch (Dasani), a sports drink after your workout (Powerade), and soda with dinner (Coke) and be individually responsible for four drinks.
Probably unnecessary disclaimer: I own a small amount of Coca-Cola stock.
