Trim the ends of water spinach and rinse under cold water to clean. Drain and cut into 2-inch pieces. Set aside.
Combine all ingredients of the cooking sauce in a small bowl. Set aside.
Heat oil over high heat in a large skillet or a wok. Once the oil is hot, toss red chili and garlic in the pan. Stir for 30 seconds or until fragrant.
Add water spinach to the pan, followed by the cooking sauce. Stir fry for about 40 seconds to a minute, until the vegetable is wilted and covered by the sauce evenly.
Add chicken bone broth and stir to combine. Serve immediately over rice.