Compost from my own garden and kitchen scraps have been more than enough. If you don’t yet have your own, try to find at a local organic farm or coop. The compost at garden centers is typically from clippings soaked in pecticides/herbicides.
Rule #1 is never use tap water with ANY chlorine/chloramine for your garden. Charcoal filters are not enough. You want to let the soil life fully thrive and do all the work.
Keep your compost pile moist enough to decompose but dry enough for air to get in. It should feel like a wrung out sponge and have no bad smells. I like to use a huge corkscrew to loosen up the bottom without heavy lifting.
Once it looks black and mostly unrecognizable, filter out the small compost with a 1/4” screen and then let that age for a few months in a bucket with holes on top until it has no smell. If you take a handful and squeeze, it should feel springy like a sponge and never clump together. It should leave no smell of any kind on your hand. Truly magic stuff.
One of the biggest mistakes is using compost that is not fully aged or mixing in “hot” organics like manure/guano that have not been composted. Unfinished fertilizer will actually pull nutrients away from your plants
Years ago I would add lots of leaves to my garden. I had huge earthworms so figured the soil was good but tomato plants did terible. Later I learned that decomposing takes the nitrogen and didn’t leave much for the plants.
The question is whether it would be good to use this "leaf tea" for watering, esp for young plants. If not fully decomposed compost takes the nitrogen the plants need, but what about this water?