This recipe for oatmeal in a jar is more of a method than a recipe, and you (honestly) don't need to use a measuring cup.
NOTE: The ingredient list above is for a PINT-SIZED jar. Please see the general instructions that follow for doing this without measuring.
Add a handful of extras if you'd like: chopped nuts, flax seeds, dried fruit...whatever suits your fancy.
Pour boiling water into the jar to the bottom of the threads. Screw on lid and invert the jar a couple of times to mix the water with the dry ingredients.
Let the jar sit on your counter while you finish getting ready for work or school. Or tuck it into your bag and take it with you for breakfast at your desk. Wherever you let it rest, in 15 minutes it will be ready to eat. Add a little butter or milk and top it with fresh fruit if you like.