Decide where you plan to put your outhouse. It should be at least 50 feet away from your home or camp and on the opposite side of your drinking water well or table. If you are unsure where the water table is located, ask an environmental geologist to help you find it.
Determine how many outhouse holes you are going to need. If there are children in your family, their hole should be at least one foot smaller than the adults' hole. If there are only adults, you only have to worry about digging one hole.
Start digging. The hole should be a minimum of 15 feet deep. This will allow for the waste to go deep into the ground to become absorbed.
Consider this hole an open septic tank. The width should be between 2 to 3 feet at the top and it should gradually decrease as the depth increases. You can dig by shovel or use a machine.
Place a potty or some other box over the the opening of the hole, then build your outhouse.