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!!!
Another option for oils is a mister.
That allows you to spray a bit of oil across all of the food - or spray it on the pan for cooking. There are a lot of different kinds of misters (as well as just 'sprayers' more like what you'd use to spray water on a plant or similar; the "misters" mostly work by pumping to pressurize).
Mio bottles would be quite handy. I've used them for cooking oil when I need a small amount for camping trips.