Camping toilets are quite inexpensive, and are something that may be needed in the event of a disaster. There a wide variety of them available on the internet, and one can even make a home-made one. Instead of using a plastic bag to catch waste, some campers use ordinary newspaper, which is then buried and the whole mess becomes completely biodegradable.
Personal sanitation depends on the situation. If you have a small number of people pick an area downwind and far away from the campsite, not near a source of fresh water. Do not defecate in a stream. Urination and defecation should be performed in two separate areas. The area for urination should be well-drained. As far as "cleaning" the anus, it is helpful for each individual to have a small "personal" squeeze bottle of water to be used to cleanse the soiled tissue. Sort of a mini-bidet. Newspaper soaked in water makes a good substitute for toilet tissue. In some survival courses they teach to keep a small rag that will be washed and used again and again. Small rags to be buried with the feces also work. Always cover feces immediately with soil to prevent attracting flies. The entrenching tool works well for this purpose.
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