In the bowl of the mixer whisk together the flour, salt and yeast, then add the water and with the flat beaters* beat until completely combined, make sure there is not flour at the bottom of the bowl. Place the dough in a large bowl, cover loosely with plastic wrap, let sit at room temperature for 2 hours, then refrigerate for 5-24 hours before using. The dough will last up to 2 weeks in the fridge.
*You can also mix the dough together with your hands or even a spatula. Just make sure you get all the flour incorporated.