We have a bucket that used to have cat litter in it. I put a hole in the top the size of a std. hose that hooks to the trailer. We use it for a day or two, carry the container to the rest room, or out house at the camp site and pour it into the toilet. If there is a dump site at the camp ground, we take it there and pour it into the opening intended for gray or black water. the hose can not be to deep into the container used as the gray water gets deeper it will stop draining properly so keep the hose short after it passes through the lid. We only put about a gallon of gray water into the container making it easier to carry to the restroom. We pour the water into flush toilets at camp grounds also. NEVER ON THE GROUND AT CAMPSITES, the water could attract bad animals; bears,or other unacceptable smaller animals!