Get an earthworm or bokashi composter use that for nutrients. Declorinate your water by letting it stand outside for a day or 2. if you have a water feature somewhere which recycles water pee into it, after a couple of weeks bacteria which turn the amonia into no2 and then no3 will come to live in there (you will also supply a fair bit of nutrient this way), use that to water your lawn.

*bacteria in certain temp ranges obviously, a boston winter won't be any good for this.