you've got heaps for soil mixing , compost making & worm farming
id probably use 1 to 2 liters per 50 liters of a coots type mixed soil , could probably use less if you wanted to mix a fare bit of soil
moisten ( not saturate ) the soil mix once you've combined all the parts , store at room temp in a dry place in a container with a lid that's not totally air tight or leave the lid off & just add a few sheets of wet newspaper pressed down over the mix to keep the moister from evaporating , check under the newspaper or lid after 7 to 10 days to see if it's activated , if it has pot up