Cholera is transmitted by what is charmingly known as the fecal-oral route. Basically the bacteria exits one host via the feces and to infect a new person it needs to be ingested via the mouth.
As we saw this can easily occur, and on a mass scale, if water sources become contaminated but it can also occur via food contamination. A potential third source is via public swimming pools and we may come back to this when we talk about Polio - which is also transmitted by the fecal-oral route.
If you read or saw the news at the end of last week you may have noticed this charming article:
Soda fountains contained fecal bacteria, study found. These reports were all inspired by a paper in the International Journal of Food Microbiology: Beverages obtained from soda fountain machines in the U.S. contain microorganisms, including coliform bacteria.
Probably little danger of Cholera but they found a variety of potentially problematic bacteria. Of course this is on top of the fact that Soda IS INCREDIBLY UNHEALTHY for you anyway.