After adapting to a certain degree of cold, Hua Jin started deliberately collecting snow and ice blocks, preparing in advance for the extreme heat to come.
She and her father would almost daily go to collect a lot of snow, placing it in Hua Jin's space to melt.
Then, using wooden basins of various sizes, she would freeze them outside the cave; in just a short while, she could collect many ice blocks, which were neatly stacked on the second floor of her space.
As for the water in the space, although it seemed inexhaustible, with a vast stream remaining, Hua Jin still planned not to waste it.
The ice blocks from snow water were all prepared for the extreme heat to cool and use in daily life; it wasn't necessary to waste potable water.
Especially since there was free water outside, why waste the water in the space?
We need to live thriftily and learn to plan.
