Fast Food Ice Bonus
Bonus... E. coli !
This was a clever school project. However, the main facts to realise is that toilet water is very very clean (the article even states this) and E. coli gets everywhere. Seriously. Your own teeth (or at least your toothbrush) more than likely have more E. coli then toilet water from a clean receptecle.
I think people should be so happy that fast food toilet bowls are getting such a thourough sanitisation.