In a large bowl, add 1/4 teaspoon of yeast to the water. Stir and let it sit for 2 minutes to activate it. If you are using dry yeast consider using only 1/16th of the yeast.
Add the all-purpose flour (if you don't have, use bread flour) to the yeast mixture and using a spatula, mix for 2-3 minutes until the dough becomes smooth. Keep mixing the dough until all the flour lumps are gone.
Cover your poolish dough with cling film to prevent it from drying out and let it rise at room temperature for 8 hours. If you are planning to use the dough after 12 hours, leave it at room temperature until it starts to bubble (30 minutes to 1 hour) and then refrigerate.