Combine the water and Quinoa in a medium sized pot and bring to boil. Reduce heat to simmer and let cook about 15 minutes, or until Quinoa has absorbed all of the water. Fluff with a fork
While the Quinoa cooks you can make the dressing. Combine the olive oil, olive juice, garlic, oregano, salt and pepper, in a small bowl. Mix well and set aside.
In a large bowl, combine the sliced tomatoes, olives, chickpeas and spinach. Add Quinoa and mix well. Drizzle the dressing on top.
Toss everything together. Serve immediately or store in the fridge until serving.