earthworm castings "tea"
First, I don't know why you wouldn't use a commercial liquid houseplant food. Way cheaper, easier, and less smelly than organics. Second, undecomposed organic matter will have to go through a decomposition process and organisms (such as molds) can be dangerous to you and your animals.
But, if you insist on making your own, you can make a solution they call earthworm castings "tea" from bagged earthworm compost you buy at a nursery. Stir a couple of cups of castings vigorously in a bucket of water and pour a couple of cups off while its swirling. Use right away on potted plants. Worm castings (poop) are rich is minerals and seem to have beneficial properties, even though the actual nutrient levels are very small.
A similar "tea" can be made from thoroughly decomposed garden compost.