It is generally recommended to store Essiac tea in the refrigerator and once opened to use it within 2 weeks. This is because the tea may lose some of its potency over time, and it may also develop mold or bacteria if left at room temperature for an extended period.
To store Essiac tea in the refrigerator, it is best to use a clean, airtight container, such as a glass jar with a tight-fitting lid. The tea should be kept in the back of the refrigerator, away from sources of heat or light, to help preserve its quality.
It is also a good idea to label the container with the date that the tea was made, so that you know how long it has been stored. As a general rule, it is best to use the tea within 2 weeks of making it, although it may still be safe to consume for a few days longer. If you are unsure about the safety of the tea, it is best to discard it and make a fresh batch.