Here are the key details about the water bottle that meets the given criteria: Capacity: 500 ml Material: Stainless steel on the inside Suitable for children over 3 years old The bottle should be safe and reliable, made of thicker 18/8 food-grade stainless steel, durable, tough, corrosion-resistant, reusable, and not retain any taste It is important to note that there are many options available for insulated water bottles, including those designed specifically for kids When choosing a water bottle, it is important to consider factors such as insulation type, BPA-free materials, and volume, among others