Fill a bucket with 1 gallon of water. Scoop 2 cups of organic compost or horse manure into the bucket, or scoop the compost or horse manure into a burlap sack and hang the sack inside the bucket. Increase the ingredients in the same ratio for additional tea.
Put the bucket in a warm, protected location and let it steep for three to four days. Don't leave the bucket in a windy or brightly lit area, as it will evaporate.
Harvest the compost tea. If you put compost directly into the water, put a cloth over the bucket and pour the water into a second bucket. If you used a bag, lift the bag out of the water. Lay the leftover compost out in the flower or vegetable garden to improve soil quality.
Put the compost tea in a sprayer and apply it to the grass or pour it directly onto the grass from the bucket. Apply an even layer of compost tea to soak the soil.