again i re-state...
urine will be bad in any hydro medium
coco, perlite, clay pebbles
you need something with an active biology for it to even work without screwing up your plants in the long run
like dr.J recommended, use soil next run, study the food web, keep your soil active. Urea nitrogen will work but it causes problems
there are organic growers that eat organically, and use their septic to fertilize crops. If you go to their house, you aren't allowed to use the shitter if you aren't 100% organic. understand this..
urea nitrogen is finicky, because the amount of nutrient in your pee depends on how you're eating, something else to understand
as i said earlier, you can make a lifetime supply of pH down with the link i provided , and as dr.j and others recommended, get a more forgiving medium (such as a buffered soil) to start with.
Coco will require pH meter or pH drops, and proper hydroponic nutes. If you use the wrong sources of NPK, they will do bad things to the medium because they don't break down (invite bad stuff)
hope that helps