There are a number of ways to make a balanced homemade liquid fertilizer. One is to mix fish emulsion with an equal amount of kelp emulsion. However, for a completely homemade liquid fertilizer, compost tea is effective, well-balanced and easy to make once you have a "ripe" compost pile. Compost tea is usually too concentrated for most plants and gardens and will require dilution before use.
Put compost equivalent to one-tenth of your bucket or bin capacity in the container. For example, if your container is a 55-gallon drum, put 5 1/2 gallons of compost in it. If you want to avoid straining the resulting compost, put the compost in a water-permeable cloth bag and suspend the bag from a stick or pole about halfway down the container.
Fill the bucket or bin with water to the top.
Drill holes in the lid to allow airflow, and cover the bin.
Let the compost tea "steep" for two to four weeks. If possible, agitate the tea daily by lifting the bag of compost up and down several times. If you aren't using a bag, agitate the tea by stirring once a day.
Remove the bag after two to four weeks. If you aren't using a bag, strain the tea.
Mix one part tea to four parts water before applying to your gardens or plants.