Place 6 cups of high-quality compost into a mesh bag or old stocking and tie the bag at the top, securing the compost inside.
Put the bag filled with compost into a large bucket or pail and add 1½ gallons of warm water. Swirl the bag in the bucket to ensure that all of the compost has been exposed to the water. Cover the bucket with a trash bag to keep the water from evaporating.
Allow the bag to sit in the bucket for 2 to 3 days. Swish the bag around in the bucket or stir the mixture with a wooden spoon 4 to 6 times each day. This will help to distribute oxygen throughout the solution, encouraging the growth of beneficial bacteria.
Remove the bag, squeezing gently to wring out any excess liquid. Drape a piece of cheesecloth over the top of a second bucket and then slowly pour the remaining liquid through the cheesecloth, filtering any large compost particles or pieces of debris from the nutrient-rich solution.
Measure the finished liquid and dilute the final product by adding 1 cup of water for every cup of "tea." Mix well and then transfer the solution to the canister of a hose-end spray attachment. Attach a hose to the sprayer and apply the fertilizer to the lawn.