To make sure your water temperature is correct when working with yeast, without having to use a thermometer, put your finger under the running water. If the water temperature feels totally neutral, not warm or cold, then it is matching your body temperature, about 98 degrees F. When the water feels just slightly warm to the touch, then it is the perfect temperature for yeast, 100 to 110 degrees F. Putting parchment paper between each flatbread when freezing allows you to remove the number you want without having to defrost the whole bag.