Or more specifically, "who?" Several documentaries over the last 10 years or so have exposed the fact that most of the food we consume can be tied back to only 4 or 5 major companies, and is ultimately WAY over processed (read: "more disgusting than advertised"). Notably, Food Inc, Fast Food Nation, and Super Size Me exposed a lot of what goes on in the food industry.
But what about the beverage industry? We (well, mostly Americans) slug Diet Coke like it's water, pound down bottled water with reckless abandon, and drink things called "juice" that don't actually contain anything mildly resembling fruit. Where does it come from?
This info graphic (click link for a large version) reveals who's manufacturing your sipping supplies.