Adds the ability to put reagents into cooking machines.

Reagents put into machines are transferred into food. Medical bread, anyone?
You can also remove all reagents from a machine if you don't want that chloral in your grilled meat.
Adds a corn oil dispenser for the greasiest machine: the fryer.
Fryer now requires a certain level of corn oil to cook with. Any less, and the icon changes to let you know it's empty.

Why yes, this does mean that fried food gets corn oil added to it.
Yes, you can put potassium and water in a fryer to explode it. Please don't.
Only because you require something in there to fry with.
The actual transfer of oil to the food is in transfer_reagents_to_food().