Using urine to fertilize your plants is easy. Here's how to do it as described in my book Compost Everything: The Good Guide to Extreme Composting: http://amzn.to/2a0V4nn
Urine is an excellent fertilizer and high in nitrogen and potassium. Better yet, it's free. Do it right and you won't burn your plants. Instead, this free fertilizer will green things up like crazy. This survival tip may come in very handy one day, especially in a grid-down situation.