The first thing you need to know is ...benzos are NOT water-soluble!
You can NOT dissolve your Valium in water. You need to use a solvent, like alcohol (vodka) or propylene glycol, then you can dilute that with water.
And the other thing you need to know...do NOT get taper advice from YouTube.
I don't understand why people do all this research on benzo withdrawal but don't know that benzos are practically insoluble in water. It states this in wikipedia. I'm glad you're around to tell people this.
And that info is widely available from many other sources. So I share you feelings.
But I suspect the main answer,
they saw it on YouTube. There are several benzo tapering videos on YouTube that are filled with misinformation, including water solubility.