Prep all kabob vegetables per instructions above.
Prep chicken: In a bowl, mix the oil, lemon juice, garlic powder, and oregano. Prep the chicken per instructions above and add to the bowl. Season with salt and pepper and toss until fully combined. Set aside.
Preheat a grill or grill pan on medium heat.
Make the watermelon salad: Toss the watermelon and mint together in a bowl. Lightly drizzle with olive oil and lightly season with salt to taste. Refrigerate until ready to serve.
Prep skewers: Thread the chicken, zucchini, peppers, and onion onto the wooden skewers, alternating each ingredient.
Brush one side of the bread with the marinade.
Cook skewers: Grill the skewers on one side until nicely charred then brush with any remaining marinade, grill on the other side to an internal temperature of 160°F (70°C) using a thermometer.
Lightly grill the bread, brushed side down, until golden brown. Then set aside.
Make the spritzer: Mix all ingredients together.
Serve: Enjoy the kabobs with bread, watermelon salad, and lime spritzer (over ice if desired).