In a medium pot, bring the water or broth to a boil. Once it’s boiling, if you're using olive oil or butter or salt, add now.
Add the couscous to the boiling water. Stir to make sure it's evenly distributed.
Immediately remove pot from heat and cover tightly with a lid. Let sit off the heat, covered, for 5-10 minutes, until the couscous has absorbed all of the liquid.
With a fork, fluff up the couscous to separate the grains.
Notes
TO STORE: Let the couscous cool before storing in an airtight container. Refrigerate cooked couscous for up to 5 days.
TO REHEAT: Add the couscous and a small amount of water or broth to a microwave-safe bowl and microwave for 1-2 minutes until reheated.
TO FREEZE: Freeze cooked, cooled couscous in a freezer-safe storage container for up to 3-6 months. Thaw overnight in the refrigerator before reheating.