I forgot one essential for boondocking.
Assuming your gray water dump is separate from your black water dump...some gray water dumps merge with the black water dump to help flush out the black water lines...more on that below.
When boondocking, you need a 5 gallon bucket. This is a great tool for draining gray water and toting it away from your site to water the trees. Gray water contains little more than coffee grounds, a few food particles (as few as possible), soaps (surfactants) and little else. It's not potable, but it's not hazardous waste. I've had some ask, "what if I pee in the shower?" Well, first, don't. Second, if you do, have you ever peed in bushes? But I'd hate to be handling pee-contaminated gray water.
When truly boondocking the vegetation will benefit from the moisture. The surfactants are actually a good soil amendment, and the few nutrients will help fertilize.
In a state or national campground, you can tote the gray water to the pit toilet or bathroom and dump it there. In the wild, the plants will appreciate the moisture - in most cases. Obviously, this doesn't work in the Everglades.
My gray water dump is a 2" line with male thread on the end.
I use this adapter to fit a short length of garden hose to make it easy to route into my bucket. When the camping trip is over, I leave the gray tank about 1/3 to 1/2 full and dump (at the dump station) without the adapter to flush out any solids that might be in the bottom of the tank or 2" line. ETrailer has a variety of options including push-on adapters.
Note on dishwater. We use paper towels for "napkins." When done eating, we use the paper towels to finish wiping food particles off our dishes and into the trash. Very little food waste goes down the drain. In turn, this keeps the gray water from being laden with food particles.
With the ability to move gray water safely off site, your only limitation on length of stay is black-tank capacity.
Meanwhile, the bucket is a great place to store blocking for your jack or other items that don't need to be sanitary. And the bucket makes a great step stool and traffic pylon. If your special site is back in a long dirt road where your RV is out of sight, "Homer Buckets" from Home Depot are orange. Put a rock in it and put it out where someone can see the site is occupied.
P.S. If your gray water dump merges with your black water dump, don't try this. It's not only questionable from a sanitation point of view, but it's also bound to cause you trouble. Anyone who sees you dumping from your black water dump is never going to believe you're not dumping sewage. So, if you don't have a separate gray water dump, you might install a T in the gray water line and create one.
All that to tell you about a 5 gallon bucket.
PPS. If the situation allows for it, stretch your black tank capacity by peeing in the bushes. Not only does it save a flush, it also marks your territory if you're in the wilderness. Coyotes and other critters may not "respect" your mark, but they'll get the message.