Traditional dry water cup

Wash it with warm water and then scald it with hot water. Don't perm it for too long. Let it dry and you can drink it.

It is best not to leave the water in the cup for too long. Bamboo changes color easily. Although it is a natural reflection, it does not affect the water quality, but it looks uncomfortable. You are usually in the north, just pay attention to make the cup slightly wet, and there is basically no need to maintain the cup in the south.