Whisk together yogurt, garlic, salt, spices, and 2 cups cold water in a large bowl. Add cucumber, avocado, mint, and dill, stirring gently to combine. Drizzle each serving with 1 tsp. oil.
Note: Nutritional analysis is per 2-cup serving.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.