Urine--whether bovine, equine, canine, or human--contains significant quantities of urea. This substance is an excellent nitrogen source for your plants. Its potassium and phosphorus levels are also equal to or higher than those of whatever commercially produced fertilizer you are currently paying very good money for. You can use your own urine to make free, constantly renewable urea fertilizer. If you're healthy, your urine is virtually sterile and free of viruses and bacteria. The bonus is that this practice saves several flushes and lots of gallons of wastewater daily.
Fill an empty 1-gallon container with water and pour it into a plastic bucket. Mark the surface level of the water on the outside of the bucket with a permanent marker. Add another gallon of water to the bucket and mark that level on it, too. Repeat until you've completely turned an ordinary bucket into a helpful measuring tool. Place the measuring bucket in your bathroom, and put the lid on it.
Urinate directly into the bucket. If this is a difficult physical maneuver for you, take a disposable plastic cup to the bathroom with you. Urinate into the cup as you sit on the toilet, just like giving a sample at the doctor's office. Dump the urine into the bucket, replace the lid and discard the cup.
Mix baking soda with the bucket of urine at the end of the day. Add 1 tsp. per gallon and stir it well. The baking soda will actually neutralize any acid present in the urine, making it even safer to use on your plants.
Pour one gallon of urine into the 5-gallon bucket. Add 4 gallons of water, because the urine is much too strong to use in its most concentrated form.
Apply the liquid urea fertilizer to one spot at the outer perimeter of each plant that you wish to feed. Give small plants about 1 pint, medium sized plants 2 pints, and 3 pints for large specimens, until you've used up half of the liquid in the 5-gallon bucket.
Add more water to the remaining half of the solution to refill the 5-gallon bucket. Pour the whole bucket full over the entire root areas of the plants you just treated.
Water the plants thoroughly.