I low-key expected the "pure water insulates from electricity!". It's part of the trope, after all. Nay, is part of the science.
Instead, what we get is pure water dissolves herb. Like, yeah, but that's not exactly how it works. Water dissolves minerals, chemicals, and other substances which are polar (molecular structure which has positively charged atom and negatively charged ones stay at opposite side) because water itself is polar (positive H+ and negative O-). Against non-polar molecules, water won't do much (i.e. hydrocarbons--oils and fats).
And it's not like water will crunch a piece of solid rock. No, unless you have a running water which applies physical erosion on the rock.