That is true @PreyBird1 and so is the consistency as mentioned above. But making your own brews at home is a life saver for me. I am rural, nutrients are expensive and for me its more about improving the soil condition using KNF ( topic below ) and permaculture methods. It just helps with the harsh environment and bottomline is strong healthy soil helps all plants fight off pests and disease.
Some of the homemade nutrients i work with are as follows:
Obviously manure from the animals, these can be used as an ammendment to old soil aswell as nutritious teas.
Worm bin, vermi compost and worm wee is gold for nitrogen, readily available. Even better bubble it up with some water and make teas with a mix 10:1 water.
I use potash from the fires I make.
Mollasses another huge ingredient for teas, and very cost effective when buying bulk. I think, I stand corrected, but majority of commercial nutrients use molasses ( black strap ) as a primary additive.
As mentioned coffee grounds ( i collect from my local coffee shop) , egg shells mixed with vinegar ( even better, recipes onlines ) . Epsom salts is also a nice cheap additive and helps the plants in many ways, same ways it helps humans too.
Now to take a deeper dive, bacteria, you want the white bacteria found under the trees when they defoliate, this is the best thing ever, I often wait a season or two and add this to good compost and mix it up.
But bottom line, teas are where its at. The fermentation and oxygenating these is a huge win and you can use almost anything.
Dried blended banana skins, dandelions, nettle, manure, worm castings… the list is endless. Good luck and shout if you have more questions. #organicgardening
Oh mulching with a think layer of wood chips, retted manure, old leaves is a big win, especially in hot arid environments outdoors, even indoors. Helps with water retention and a layer of good bacteria, aswell as keeping bugs, slugs and problems away, just ask @wow_arizona