Using your VitaJuwel ViA Heat Guardian Insulated Crystal Infusion Bottle is easy. First, if you want to make tea, put loose tea in the extra - large tea strainer (sold separately) and place it in the bottle. Then add hot or cold water as you like. You can enjoy the view of the gemstones inside while sipping your drink. Remember, the bottle is made of glass, so handle it carefully to avoid breakage. When cleaning, use a mild detergent and warm water. You can use a soft brush to clean hard - to - reach areas. After cleaning, dry it thoroughly. Don't use abrasive cleaners as they may scratch the glass. This bottle is great for both hot and cold drinks, so you can use it throughout the day.