When heating up cold food in microwave it oftens comes out pretty dry, and I like juicy food. So I add 1 or 2 teaspoons of olive oil on the food before heating it. I'd be easier though if I had some kind of small device  
I did a cheap kitchen hack by reusing an empty Sriracha bottle after cleaning and drying it up for my oil drops. Here is how the bottle looks:    And it is perfect for dropping oil. The nozzle also lets me increase or decrease the diameter of the oil drop.  If you don't happen to like this sauce, try it with some Asian food. You'll love it mostly!!! 