One of the biggest things the rural off gridder needs to take care of is human waste disposal. There are a few options, one is the
Joseph Jenkins Humanure method of composting the waste material, that works very well but not everyone is on board for handling their own poo and waste products, and having company over can create its own set of challenges. If you have sufficient water resources, you may want to have a regular flush toilet, something unassuming and un-intimidating for you, your family and friends who may come visit.
For that you may choose to install a septic system. Typically that costs a LOT of money, is highly regulated (and for good reason!), but if you are careful and considerate, you can create a small septic system that will handle a small cabin or trailer for one or two people.