Pooping and peeing are basic human functions. These are simple in a sticks and bricks house with indoor plumbing but take planning in a camper.
The next simplest may be available if you are camping in the outdoors. You can dig a cat hole and do your business there.
You can also use chemical, plumbed, or composting toilets. You might be able to get away with peeing in a jar and pooping in a bag for later disposal.
Read more info on toilets.