Bring water to a boil in a medium saucepan over high heat. Add quinoa; reduce heat. Simmer, covered, for 15 minutes or until tender. Remove from heat; let stand, covered, for 10 minutes. Fluff with a fork. Transfer to a large serving bowl; let cool.

Add sun-dried tomatoes, onion, feta cheese, and basil to quinoa. Drizzle in dressing ingredients; toss to combine. Cover; refrigerate until serving time.

Sprinkle with almonds before serving, if using.