Check the cooking time for the couscous per the instructions on the package. Depending upon the couscous you have chosen, time will vary by a few minutes 5-10.
Bring the water in a saucepan to boil. Once boiling, add the couscous, unsalted butter and a pinch of salt (optional). Stir once to incorporate. Remove from the heat, cover, and let sit for 5 minutes (again, check the instructions on the package, as different couscous will have different sit times).
After resting time, fluff the couscous with a fork.
While the couscous is cooking, mix the dressing (see instructions below), dice and slice each of the four ingredients: feta (dice), cucumber (dice), olives (slice/quarter), and tomatoes (quarter).
To combine: add salad ingredients (see video), and finish with dressing - add less than you think you will need. Toss salad and taste. If you need more dressing, add. I usually do not need all of the dressing I have made and reserve it for salads throughout the week.
Place salad in the refrigerator for one hour. Then serve and enjoy!