Dec 13, 2023 · These composting toilets are expensive and not great for off-grid or emergency planning. 3. Agitator. Each time you go #2 in a compost toilet, you should add a bit of peat moss or sawdust. Then, you need to rotate the chamber. To do this, portable compost toilets have a handle on the outside. The handle rotates the chamber to agitate and aerate