Mary, I do something similar on my Scamp
13, but instead of a 5gal bucket or a BlueBoy, I use a one gallon laundry detergent jug with pour spout removed and a hose-sized hole cut in the cap for the short piece of garden hose.
Very easy to grab and take to toilet and pour down; rides on tongue, bungeed down, when not in use. Close fit between hose and hole keeps the tiny black flies from accumulating.
I have heard that Florida State Parks now require built-in holding tanks even for gray water; my guess (only that, a guess) is because of the insect problem from open buckets. Not sure at all what that means to tent campers!?!
Cost is very low; they are available in your local laundromat's trash can in a variety of colors, but the experienced scrounger will chose one with press-in pour spout for easy removal. Guy Alert -- Get a second one to use as a nite-time Yellow Water Tank -- Sorry ladies...
Pete and RatLadies
PS Guys -- DON'T cut the hole in the cap of the YellowWater Tank...