Prep all ingredients per the instructions above.
Combine water and cucumber slices in a pitcher. Refrigerate for at least 20 minutes to infuse.
Heat olive oil in a medium pot over medium heat. Add onion, carrot, and celery. Sauté until softened.
Stir in garlic and cook briefly until fragrant.
Add chicken and cook, stirring occasionally, until lightly browned.
Add chicken broth, zucchini, diced tomatoes, kidney beans, oregano, basil, salt, and black pepper. Bring to a gentle boil.
Reduce heat to low and simmer for 10 minutes.
Stir in elbow macaroni and continue to simmer until the pasta is tender (refer to cooking time on package). Remove from the heat.
Stir in spinach until wilted. Adjust seasoning as needed.
Serve the chicken minestrone soup with sourdough bread and cucumber water.