Wash the dried soybeans thoroughly and soak them for at least 8 hours.
Drain the soaked soybeans and place them in a pot to boil.
Blend the boiled soybeans with water until smooth.
Strain the mixture through a sieve to separate the soy milk.
Pour the separated soy milk into a pot, stir over medium heat, and boil for 10 minutes.
Cool appropriately, then pour into bottles for storage.