Prepare ingredients as listed.
Make cucumber water: Combine sliced cucumber with water in a pitcher and chill in the refrigerator while preparing other components.
Preheat the grill on medium heat.
Bring a pot of salted water to a boil and cook macaroni according to package directions. Drain and set aside.
Heat olive oil in a large skillet over medium heat. Add onion, bell pepper, and garlic; sauté until softened.
Add ground turkey, cumin, chili powder, smoked paprika, salt, and black pepper. Cook until the turkey is browned and fully cooked.
Stir in tomato paste and cook for 1 minute. Add chicken broth and simmer for 3–4 minutes until slightly thickened.
Grill the corn on all sides until nicely charred and tender.
Stir cooked macaroni and cheddar cheese into the turkey mixture until creamy and well combined.
Serve the turkey mac with grilled corn, watermelon and cucumber water .