Grate the fresh ginger with the skin, and set aside.
In a clean jar, dissolve the white sugar in a bit of hot water. Mix to fully dissolve. Fill the jar 3/4 full with room temperature water.
Put the ginger in the jar and give it a stir. Place the lid on the jar.
Keep the ginger bug at room temperature. Stir the mixture with a spoon to aerate for the first 3 days. Close the lid back up after stirring.
After 3 days, you may add an extra tablespoon of ginger and sugar to further encourage microbial growth.
Check the ginger bug every day for a week. You should notice the mixture turning foamy, fizzy, and aromatic.
The process of creating a ginger bug can be finnicky, sometimes it may seem like it hasn't worked, but it may just need a bit more time to become active.