1. Choose tea suitable for cold brewing, such as green tea, oolong tea, white tea and herb tea, while traditional teas such as black tea and Pu 'er are not suitable for cold brewing.

2. The containers should be glass bottles or ceramic pots without peculiar smell and pollution, instead of plastic or metal containers.

3. It is best to place cold tea in a cool place, not affected by sunlight, high temperature or humid environment, to prevent odor and bacterial growth.

4. After the cold tea is left for a certain period of time, it is best to filter or pour it out to avoid the tea being too strong and affecting the taste.

In order to keep the freshness of tea, it can be stored in the refrigerator, but it should not be more than 48 hours. The temperature in the refrigerator is about 4℃. Too low temperature may affect the taste and fragrance of tea.