Nutella pools are breeding grounds for bacteria.
Nah.  Nutella is shelf stable even after opening.  Osmotic content is too high w/all that sugar to grow much.  My subspecialty is Infectious Diseases and that pool wouldn't worry me a bit 
 
Stuff will be stable at least for an 8 hour car ride.  Can I throw in Craig Ferguson and Kevin McKidd?  At least Craig is getting more toward my age range...don't want to be accused of being a cradle robber!  

I'm going to Costco and picking up a mega-size Nutella.  If Pris doesn't need it for the pool, then I'll just put it on the table at dinner and run away quick!