Turn this pasta salad into a main meal by adding grilled chicken.
Cook pasta according to package directions. Drain; rinse with cold water and drain well.
Make vinaigrette: In a small bowl, whisk oil, lemon juice, vinegar, water, garlic, salt and pepper until blended. Stir in oregano.
In a large bowl, combine pasta, vegetables and olives. Add vinaigrette and feta cheese, toss gently to combine. Refrigerate, covered until serving.