Eggshells, used coffee grounds, make your own compost from kitchen scraps and newspaper, oh and of course jizz sauce
If you're gonna use pee pee here's a lil copy and paste from the interwebz
Dilution is The Solution
Dilute fresh urine at a 4:1 ratio and apply to the root-zone of corn every two weeks or as needed. (Some people say corn, being a grass, can handle fertilization with straight urine. Proceed with caution.)
Dilute fresh urine at a 10:1 ratio and apply to the root-zone of fruiting plants like tomatoes, peppers and eggplant, or to leafy crops like cabbage, broccoli, spinach and lettuce every two weeks or as needed.
Dilute fresh urine at a 20:1 ratio and water in to the root zone of seedlings and new transplants.