I chose to set the shutter speed manually, but let the camera choose aperture and ISO. A desk lamp was over my right shoulder (as you can see in the reflection), but aimed off subject at 45 degrees.
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Pretty much a true sentiment. The light source has created a hot spot. I would say flash but that is too close to flush and the cards may cause a blockage.
Safest would be to cut them up first. IMHO you're too close up, it took me too long to figure out what the cards are lying in - I guessed at an ashtray, a plastic tray and a sink before I figured out the meaning of the photo. If I had been busier today, I wouldn't have bothered and rated it very low.
Technical: Fits the challenge. Looks a little underexposed overall but lighting is too hot on the water and the rightmost card. Diffuser maybe? Composition feels a little too tight on the bowl, took a sec to figure out what it was. Focus is good.
Personal: Creative idea- I hope none of those are real ;-)
No, not wise. The toilet will clog and you will have to hire a plumber, which will cost a lot!
This is very creative anyway, but I do have a few nits with the photo itself. Next time try some more interesting lighting; side light would have worked well here. Also, I might have tried some other angles, or at least a different crop; I am not sure the asymmetry works well here.