In a large stock pot, add water, broth, and tomato paste; whisk to combine. Turn heat to medium, and add spaghetti to the pot followed by oregano, basil, pepper, salt, red pepper flakes, zucchini, mushrooms, yellow squash, asparagus, onions, and garlic. Add diced tomato with liquid from can. Drizzle olive oil over the top. Cover, turn heat to high and bring to a boil.