Depending on your comfort level and access to facilities, a portable toilet or knowledge of nearby campsites with facilities is important. One of my van life essentials when designing my van was a toilet. When travelling I dump my pee every few days in gas station toilets or on the ground (not near a lake or water source). I deposit my bagged poo in dumpsters. I try to find the large ones which are dumped into large trucks rather than in bins where a person has to empty it.
If I am dispersed camping for a longer period of time, I often will pee outstide. I have a compost toilet and use wood shavings to keep the smell down, this works really well for me! If I am out for a week or more I will find a transfer station to dump my garbage and poo when I am back in civilization.
