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In ancient times, when taking medicine, people would carefully select water. Therefore, for decoctions, new-drawn well water surface layer (Jinghua Shui) was mostly used, to take advantage of the natural heavenly qi floating on the water surface. It should be decocted with gentle fire, and taken slowly while warm. The *Jin Gui Yao Lue* states: "For those who boil herbs to extract juice for detoxification, although it is said to be for emergency rescue, it should not be drunk hot. Various toxic diseases become more severe with heat; it is suitable to drink them after freezing." This refers to treating heat toxins and pungent-hot medicinal flavors, which should strictly follow this example. All tonifying medicines should be drunk warm. Bitter-cold fire-clearing medicines should be drunk hot, which is the method of "using heat due to cold" (Re Yin Han Yong). Zhang Zhongjing, when decocting spleen-firming medicines, made Ganlan Water by stirring it ten thousand times, to take its fluid nature that does not assist kidney pathogenic factors. Stirring water with a ladle a hundred times is called Bailao Water, to take its agitation to remove old accumulations. Cheng Wuji said: "Zhang Zhongjing treated Shaoyang syndrome with stagnant heat in the interior causing yellow complexion using Mahlian Lianqiao Chixiaodou Decoction, decocted with Liaoshui (rainwater), to take its thin flavor that does not assist damp-heat." Boiling new-drawn water until it bubbles like hemp seeds is called Mafei Tang, to take its lightness and floatiness to scatter nodulated heat. Decocting medicine in an empty vessel until fully cooked is called Qingjiang Shui, to take its downward trend without upward surging. Taking emetic medicines requires Jishui (vinegar juice), to take its turbid flavor guiding disease upward to vomit phlegm-fluids and retained food; sour and bitter inducing vomiting and purging belongs to Yin methods. Decocting purgative medicines to eliminate evil filth uses Dongliu Shui (east-flowing water); the *Ben Jing* states that east-flowing water is feared by Yunmu Shi (Mica). Decocting diuretic medicines uses Jiliu Shui (rapid-flowing water), to take its moving nature. Decocting medicines for treating water-reversal vomiting uses Niliu Shui (counter-flowing water), to take its upward surging of phlegm-saliva. Decocting medicines for Yang-excess and Yin-deficiency causing insomnia uses Qianli Liushui (water from a thousand miles away), to take its rapid draining nature. Decocting medicines for heatstroke with coma, or uncontrollable laughter after eating maple tree mushrooms, uses Dijiang Shui (earth pool water: dig a pit in the shady wall, fill with water, stir and clarify), to take its ability to save nearly exhausted Yin. Decocting medicines for heatstroke with loss of sweat, or cholera with unceasing diarrhea, uses Suanjiang Shui (sour fermented water: made from glutinous rice fermenting tofu curds, or acid water from grinding rice paste), to take its ability to gather collapsing Yang. Yellow mold rainwater washes sores and scabies, removing macules. White Dew rainwater washes skin and face, reducing blemishes. Autumn dew is clear, stopping malaria and removing irritability. Winter snow has a mutton-like odor, assisting Yang and controlling fire, treating epidemic febrile diseases caused by seasonal pathogens, and resolving carbuncles. Hail water is violent, stirring wind and causing epilepsy. Summer ice is yin-congealing, causing stagnation and masses. Cinnabar leaf and Calamus dew both brighten the eyes. Leek dew removes vitiligo. Campion flower dew damages the eyes. Indigo-infused water detoxifies and kills insects; if leeches are accidentally swallowed and the abdomen turns yellow, drinking this water brings relief once the worms pass. Flower-vase water is toxic and harms humans, especially that of winter jasmine. Brine is salty, bitter, and highly toxic; applied to eroding sores, tinea, and venomous insect bites penetrating flesh, it dissolves them immediately, but should not be applied to bleeding wounds. Livestock dying after eating one he of it proves human mortality similarly. Raw-cooked mixed soup with slight saltiness: cholera patients drinking one or two sheng will vomit all phlegm and food and recover. Fangzhu Shui is water from large clams, collected facing the moon, obtaining the essence of extreme Yin, thus brightening eyes, quenching thirst, and removing irritability; applying it to burns and scalds is effective. Shangchi Shui is water from bamboo fence tops; Chang Sang Jun drank it, allowing Bian Que to see through organs and perceive people behind walls. Dong'e Well water decocts Wulupi Jiao (Donkey-hide gelatin) to treat rebellious phlegm-blood; Qingzhou Fanggong Spring water makes Bai Wanzi (White Pills) to benefit the diaphragm and resolve phlegm. Both are tributaries of Ji River. As for ancient tomb abandoned wells, stagnant water in marshes, mountain spring waters with turbidity, and various waters having five colors after standing overnight, all are toxic. Not only are they unsuitable for ingestion or decocting medicine, even washing with them is taboo.