Which of the following is NOT an over-the-counter product commonly used to make meth?

The correct answer identifies bleach as not being an over-the-counter product commonly used to manufacture methamphetamine. Methamphetamine production typically involves various chemicals that are directly precursors or reagents in the synthesis of the drug.

Red phosphorous, water, and hydriodic acid are all substances that can be obtained or utilized in the illegal production of meth. Red phosphorous can be derived from over-the-counter safety matches and is often used in meth synthesis. Hydriodic acid, while more difficult to obtain, can also be used in the production process when it comes from specific precursor chemicals. Water is essential in many chemical reactions and is ubiquitous, making it a necessary component in numerous chemical processes, including those involved in meth production.

On the other hand, while bleach is a common household cleaning agent, it is not a direct ingredient or component in the synthesis of methamphetamine. Thus, it does not fit the category of over-the-counter products that are typically used in the illegal production of meth. Understanding this distinction is important, especially in recognizing the common methods and materials associated with methamphetamine synthesis.