<human>: Which of the following solutions is better for the following goal:
To feed the sourdough starter,

OPTIONS:
- Remove all but one tablespoon starter from its jar, add 1/3 cup water and 1/3 cup soap, and stir with a spoon.
- Remove all but one tablespoon starter from its jar, add 1/3 cup water and 1/3 cup flour, and stir with a spoon.
<bot>: Remove all but one tablespoon starter from its jar, add 1/3 cup water and 1/3 cup flour, and stir with a spoon.