The boiled drinking water (100oC) is brought to the suitable temperature to the yeast to function as ten - 15oC. This temperature is dependent upon the type of yeast and the type of beer. Saigon (also formally known as Ho Chi Minh Metropolis or locally in Vietnamese as Sài Gòn) https://felixloopn.theblogfairy.com/27960142/the-best-side-of-sai-gon