Most of you know that my grandmother (who has severe Myositis and is confined to a wheelchair) pees into paper cups in the kitchen because she can’t go to the bathroom. She’s now on a laxative because she has pneumonia and the antibiotics messed with her system. Well, just a few minutes ago I noticed her obviously butt naked at the kitchen sink and I didn’t know if the laxative took effect and she was defecating in an extremely unsanitary way.
To answer your question, the proper way to dispose of feces is in the toilet.