I brought back the water and soil from Huangshan Mountain. I don't know how to preserve it so as not to go bad.

Heat it first to kill bacteria and other microorganisms inside, and then store it in a closed container.

In fact, it is meaningless to save only a little soil. I suggest you plant some plants in the soil to absorb aura from the soil of Huangshan Mountain. Aren't the grown plants more ornamental?