Checking for bacteria takes a couple of weeks and a petri dish in lab conditions, doesn't it? I doubt there's much you can do at home.
Growing a culture usually takes 24-48 hours, requires specific agar plates, and knowledge of what bacteria grow in what environments.
There are test kits for the presence of colliform bacteria (like E. Coli) in water, but they are fairlry expensive.
Here is a link for a company that has food poisoning test kits.
US firm Magna Medical Services introduces travel test kit for food poisoning bacteria – 14/08/07 | TheMoodieReport.com