Into your glass jar add 3/8 cup flour, using the coffee scoop, and 1/4 cup of water, using a liquid measuring cup.
Stir thoroughly with a spatula or spoon until no lumps remain. The consistency should be like a thick pancake batter and will thin out a bit with time.
If it is thick like sticky dough, add a few drop more of water and stir. Do this until you reach a thick pancake batter consistency.
Place something on top of your jar that will allow for airflow, but won't let bugs in. I have used everything from cheesecloth with a rubber band to a napkin tied with twine, to a specially made jar cover.
Place your starter in a warm place on your counter where you will remember to feed it. The temperature should be at least 70 degrees F in this location, but not over 80. If your kitchen is colder than this, then on top of a fridge or freezer, or in a room with a wood stove might be a better location. If your kitchen is hotter than 80 degrees F than you may have to feed your starter more often than twice per day when you are getting it started. Don't worry, it will only need this daily attention for the first month!
In the evening, or about 12 hours after starting your starter, feed it in the exact same way: ⅜ cup of flour and ¼ cup of water. Stir well and cover.
Continue feeding it each morning and evening for 4 more days in the exact same way.
Step On day 6, your starter should be lively and bubbly and ready for an easy recipe, such as a batter bread, but not quite ready to rise a regular loaf of bread. You can also use what is often referred to as the “discard,” in a recipe for something such as brownies, biscuits, or pancakes.
On day 6, start by pouring your entire starter into your batter bowl. Take this opportunity to wash your container.
Remove ½ cup of the starter, and put it back in the bowl or jar where it lives.
Feed your starter its regular feeding and place it back in its warm place on your counter, making sure to cover the top.
The activated batter or discard that you have removed is then ready for use in your discard recipe.
You will continue this process for about 4 weeks, cleaning out your jar and using the discard every 6-7 days (or before it bubbles over if it is very active!). Don't forget to save 1/2 cup to keep your starter going!