How can you determine whether a sharpening stone is meant to be used with oil or water?

To determine if a sharpening stone is meant for oil or water, check the manufacturer's instructions or packaging. Stones labeled as "oil stones" are designed for use with oil, while stones labeled as "water stones" are meant for use with water. Additionally, the texture of the stone can provide a clue - oil stones are typically coarser and denser, while water stones are usually softer and require soaking before use.