This bottle is completely natural and Organic. Every time after use, we must open the lid and let it dry for 2 hours. Once in a week, the bottle needs to be cleaned by a brush very softly. We can use it continuously for 8-10 hours on a daily basis and kindly ensure that we don’t keep it with water for more than 2-3 days and it would affect the durability. Please don’t pour hot or cold water into it directly, advisable to use water with normal temperature for better durability.