Are chlorine removal water drops a thing ?

[Whiterose]

Ahh guys . Thanks for the tips, but I should have clarified what my post was asking,
I already give him filtered water so I'm not too worried about de-chlorinating it. I'm really just wondering if anyone can recognize what the bottle in the pic is. The guy I bought my snake from said it was important (and that it dechlorinated the water of course) but he never said what it was, and I can't figure it out.