Add the olive oil, water, vinegar, garlic, salt, lemon juice, dill, and parsley to a blender. Blend until the dressing is smooth and creamy.
Cook the quinoa according to the package instructions. Allow it to cool completely before assembling the jars.
Divide a small amount of dressing among clean mason jars.
Layer in the grape tomatoes, cooked quinoa, cucumbers, sun-dried tomatoes or roasted peppers, and feta cheese.
Seal each jar tightly and refrigerate for up to 4 days.
When ready to eat, pour the Summer Quinoa Salad Jars into a bowl and toss everything together so the dressing coats every ingredient evenly.