Final answer:
Water is not used in the Gram staining method. The procedure involves the use of crystal violet, Gram's iodine, a decolorizing agent, and a secondary counterstain.
Step-by-step explanation:
The role of water in the Gram staining method is not mentioned in the provided information as a decolorizer, mordant, or secondary stain. It is important to note that water is not used as a specific component in the Gram staining procedure. Instead, the procedure involves the use of crystal violet (a primary stain), Gram's iodine (a mordant), a decolorizing agent (usually ethanol or an acetone/ethanol solution), and a secondary counterstain (usually safranin).