Rootless water is actually rainwater. In ancient times, doctors preferred to have people use rootless water to decoct medicines because this kind of water descended from the sky and didn't carry even the slightest ground dust, making it extremely clean.
However, in the modern world with severe pollution, if someone dared to use rootless water to make medicine, they would definitely be tired of living and ready to try some fancy way of courting death!
The rootless water Shuangshuang summoned naturally wasn't this polluted kind but was gathered from the water vapor in the air and purified with mana, making it even cleaner than the ancient version and ideal for spellcasting.
