>what has keep them alive in a drawer or how do they manage flying through the air without any food?

Coughed? Bacteria in the air. Sneezed? Bacteria in the air.
Standing near someone who splits a little while talking? Bacteria in the air and on your clothes. Sudden movement that shakes those bacteria from your clothes -> bacteria in the air.

Even if it's not in the air and you use sterilised gloves, as soon as you touch anything that isn't sterilised you have bacteria on your hands and transfer them to the steak when touching it.
And so on.