In a bowl, mix together water and sourdough starter. Starter should be floating in the water, indicating it is the most active and will give you the most lift for your bread.
After mixed, add salt and mix again.
Add flour and mix until combined.
Cover with a dish towel and give it a few folds throughout the day if possible.
Transfer to banneton or towel-lined bowl.
When ready to bake, transfer to a parchment lined dutch oven.
Preheat oven to 425F. When ready, put loaf in dutch oven with lid on for 20 minutes. After 20 minutes, remove lid and bake for an additional 40 minutes, until golden brown on the top.
Allow to rest for at least 10 minutes before cutting into the loaf.