If you happen to own a football stadium--you could pipe the result of all those urinals to a big tank in the basement--there is your raw material. I know of a green-trending horticultural garden that has water-free urinals--they do not flush--don't waste water. I am not sure what is the analysis of the raw material--but it could be diluted as needed. Perhaps freeze dried to reduce weight for easy shipping. Easier to handle, more sanitary than sewage in general.
Perhaps used to feed ornamental trees at a nursery--non edible crop to reduce the ick factor.