Eighteen jars of water are not Wang Xizhi's, but his son Wang Xianzhi's. When Wang Xianzhi was twelve years old, he realized that his calligraphy could not compare with his father's. Determined to practice hard, I found an eighteen-mouth jar full of water, and made up my mind to practice calligraphy with the ink in the jar, and I will never stop until I finish it.
Eighteen jars of water means determination.
I used to admire Wang Xianzhi's perseverance. Seeing Evaporation today is really unique.