How do you make water clean?
You make water clean by boiling it.
Usually, you will not have an intension to drink dirty water, not putting yourself in danger, if clean water disappear, one solution is to force yourself to find another source of clean water if you did'nt find at least, you may try contaminated water but make sure to use strain, clean container and boil it properly.
One way to clean grout is to make a mixture of baking soda and water and applying with a scrub brush or toothbrush. One can also make a mixture of bleach and water, apply to the grout, and let it soak for 15 minutes before scrubbing. There are also commercial products meant to clean grout, including MK Tile and Grout Clean.