My recommended basic formula is available commercially under  Nature's Guide label.  Garrett Juice Plus from Soil Mender is the newest product and contains liquid fish. It comes in a concentrate and ready to use mix. 

To make your own, here are the instructions:

Mix the following in a gallon of water.

Garrett Juice (ready to spray):
1 cup compost tea
1 ounce molasses
1 ounce natural apple cider vinegar
1 ounce liquid seaweed

For Garrett Juice Plus and more fertilizer value add: 
1- 2 ounces of liquid fish (fish hydrolysate) per gallon of spray.

For disease and insect control add:
¼ cup garlic tea or
¼ cup garlic/pepper tea
or 1 - 2 ounce of orange oil

For homemade fire ant killer add:  2 ounces of orange oil per gallon of Garrett Juice

Note 1:  To avoid burning plant foliage, the ready-to-use solution should not have more than 2 ounces of orange oil per gallon of spray.

Note 2:  We now know why the mix works so well, not only on the foliage, but also in the soil.  The ingredients are a well balanced blend of nutrients and food for both beneficial fungi and bacteria. 

Garrett Juice Concentrate: Mix the following: 1 gallon of compost tea or liquid humate, 1 pint liquid seaweed, 1 pint apple cider vinegar, and 1 pint molasses. To make Garrett Juice Plus add 1 pint fish hydrolysate. Use 1½ cups per gallon of water for the spray.