The boiled h2o (100oC) is brought to the appropriate temperature to the yeast to operate as 10 - 15oC. This temperature depends on the type of yeast and the type of beer. We really wrote a complete guide about purchasing in Ho Chi Minh City that you ought to look https://sai-gon93602.newsbloger.com/28644758/the-best-side-of-sai-gon