What differentiates potable water from non-potable water?

The correct answer highlights that potable water is characterized by being free of harmful contaminants and is safe for drinking. This definition is crucial because it clearly delineates potable water from non-potable water based on safety standards and suitability for human consumption. Potable water meets specific regulatory criteria ensuring that it does not pose health risks when ingested, which includes being treated to remove pathogens, toxins, and harmful chemicals.

Other choices do not appropriately define potable water. For instance, temperature does not inherently determine whether water is safe to drink or not. Similarly, being suitable for irrigation pertains to the usability of water for crops but does not necessarily indicate its potability. Lastly, while water may be bottled and sold, this is more about its packaging and distribution rather than a definitive characteristic that makes water potable. Thus, the essential distinguishing factor is the safety and suitability of potable water for drinking.