I would like to congratulate you on your urine fast. Though I've been
ingesting my urine for over two years with good results, I haven't had the
courage to yet do a urine fast.
If you haven't yet read it, get "The Water of Life" by Armstrong
who cured all sorts of disease with urine fasting, and nothing else. I
know that he had some of his patients on urine/water only for as as long as you
are planning, and he cured all sorts of disease, including gangrene.
I would ignore those who think you shouldn't ingest urine during a
fast. It's what cures you.