“[A] team of microbiologists from Hollins University found that 48% of sodas tested from the fast food fountains contain coliform bacteria, which is typically fecal in origin. And most bacteria found were antibiotic resistant, as icing on the cake.”
And, of course, the ice in many of those soda fountains has already been shown to be nastier than the average toilet.
Think that is scary? Try testing most areas of your house that you think are clean.
I just try not to think about these things.