The phrase "toilet bowl" refers to a bathroom fixture used for flushing waste. It is a rounded or oval-shaped container that holds water for flushing down bodily waste and other materials. Full definition
I suppose this is a good backup solution for when you run out of toilet bowl cleaner. (treehugger.com)
It's a mystery why pets find toilet bowl water so delicious, but beside the aesthetics there may be genuine causes for concern. (aspcapro.org)
Also beware of letting your pooch drink water from toilet bowls and dirty water bowls as they may contain bacteria that may be harmful to his health. (petsmagazine.com.sg)