6. The temperature inside the pan will drop a little when the grain is added. The goal is to keep the temperature between 65 and 67 degrees Celsius. Your brewing bag may not be suitable for direct heating. So, if the temperature drops below 65 degrees, add SMALL amounts of boiling water, from a kettle, and stir until you’re back on track. If the temperature raises too much, simply add some cold water. Don’t worry about diluting the beer too much and don’t worry too much if it goes high or low for a few minutes, it’s not a bomb, it’s beer!