Odors can be added to simulations using whatever you can find to create smell. I have heard of people using different cheeses (like Limburger, etc.) to create odors. In my moulage kit I have a tiny bottle of "Morning breeze" which is a very pungent, malordorous liquid. It looks like a perfume bottle, but trust me it doesn't smell like perfume! I have also seen items sold online, such as "poo in a can" which comes out looking, and I would assume smelling like real poo. I know that if you mix parmasean cheese and lemon juice you can make vomit that has a distinct odor.
My suggestion would be to go online and look around at prank stores to see what they have that you may be able to use. I would caution you though, that when using odor in simualtions you must be careful and use as little as possible becuase odors can be very powerful and lingering. If you use too much your simulation lab will not be a very pleasant place until the air clears out.
Lori Nelson
Simulation Technician
Rural Health Sciences Institute
College of the Siskiyous
www.lnelson@siskiyous.edu