A lesson from catty litter: toilets to be made out of bio-degradable, locally or centrally sourced absorbant materials, absomix, such as sand, sawdust or ash. After use, and just like our professors do (cats), absomix is scattered, maybe with foot scuff, over the waste. Now the lesson from dogs; take one bio-degradable doggy poop bag place it over hand and pick excrement into bag and seal. Bingo! Separation of urine and excrement!