This may sound odd but I've been doing some research into this very thing. Coffee grounds, dried and mixed into the soil, just sprinkled around the top of the soil, and watered in will provide nitrogen, and potassium for your plants. That just one household item you can use. And for flowering baking powder will provide phosphorus for blooming and will bring down the acid in the coffee grounds, you could a soda, or cola diluted in water for the same thing, like Pepsi Throwback as it contains natural sugar, and not corn syrup, and has a high phosphorus content. You can also on the net and search "Homemade Fertilizers" there you can find other food items that provide what you are looking for. I hope this is helpful to you:smokin: