A reusable water bottle is a container designed to hold liquids, primarily water, for repeated use. Made from materials like stainless steel, glass, or BPA-free plastic, these bottles help reduce single-use plastic waste. They often come with features such as insulation to keep drinks cold or hot, and some have built-in filters for purifying water. Using a reusable water bottle promotes sustainability and encourages hydration. Many people carry them while exercising, traveling, or at work. Brands like Nalgene and Hydro Flask offer various designs and sizes, making it easy for individuals to find a bottle that suits their lifestyle.