Maintaining a lawn can become expensive due to the cost of water and supplies. You can reduce some of the expense by installing grass that is drought resistant and by making your own fertilizer. Making and applying your own grass food lets you control what chemicals are being deposited on your lawn and lowers your cost.
Combine one cup of Epsom salts and one cup of ammonia in a glass jar. Stir to mix it together. This is the concentrated fertilizer. You can add this to water as you need it. A little goes a long way. As an example, this entire portion would work with 32 gallons of water.
Open a spray container that can hold at least a gallon of water. Fill it with water, keeping track of the number of gallons that you put in the container.
Add some of the concentrated fertilizer mix to the water. Add 1 tbsp. for every gallon of water.
Spray the lawn to coat with the fertilizer. Two gallons will cover about 200 square feet, so mix accordingly. The nitrogen in the ammonia will help keep the grass green. The magnesium in the Epsom salt will encourage seeds to grow, help plants absorb nitrogen and help make chlorophyll. The sulfur in the Epsom salt will help with chlorophyll production.