https://www.freedrinkingwater.com/products/ro-hi-detail

Probably because sour would make your lips pucker? I think lemons would be more obvious.

Personally I would include it just so that the next homeowner doesn’t curse you when they go to drill something into an expected stud that isn’t there.

What’s his work like? Reading some of the descriptions on his site it sounds like it has some horror elements.

Try threading a wood screw into the hollow pin until it grabs, and pull it out while twisting with a pair of pliers.

How would someone get started doing this?

This would make a good community, post news stories and have other people try to predict conspiracy theories about them!