Rather strange off the cuff questions! Perhaps you could explain what is your interest in order the answers may be more directed towards your sphere of interest?
As far as fire training, this is part of annual training for pilots which involves occasional extinguisher discharge under Fire Service supervision. Pilots are well briefed on Emergency equipment and locations and all aspects of handling airborne fires.
Pilots are not trained to handle food, but eminently qualified to eat it. Freight dogs may be trained in food handling, but from what I can see, they probably don't even bother to cook it. Just stick a little stick in it and suck it in their seats like a giant lollipop.
Long range flights have relief crews with opportunities for rest in rotation. Difficult to answer more without knowing why you wish to know.