Firefighter here, confirming that water is, indeed, the best thing to use to put out (Class A) fire(s).

Edit:  Yes, smartalecks, unless it's an oil/grease fire.  Then you should use a class K fire extinguisher or baking soda.  Do not use flour or water.  If it's electrical, use a dry chem or CO2 extinguisher.

**Edit**:  Also, kids, don't forget to call 911.