The boiled drinking water (100oC) is brought to the appropriate temperature for that yeast to operate as 10 - 15oC. This temperature will depend on the type of yeast and the kind of beer. Val grew up in Portland, Oregon but moved to Oahu over a whim again in 2013. https://sai-gon27169.fare-blog.com/28318300/the-fact-about-sai-gon-list-that-no-one-is-suggesting