You can chop all the ginger in advance and keep it in the refrigerator to use each day as needed. Don't overfeed your ginger bug. It needs time to digest and convert sugar. If your culture grows mold or smells bad, toss it out and start over. If you aren't sure it's ready, just give it the full 7 days to ferment. Store your freshly fed ginger bug in the refrigerator and feed it one tablespoon each of chopped ginger and raw sugar every week.