(no affiliation)
That's a great idea. Do they sell those lids separately? I already have buckets and liners. In the old days in other countries (WWII) people put a couple boards over a barrel to sit on. And used a cloth they carried to wipe themselves. People nowadays are so spoiled.
Never mind. Found a snap-on that fits standard 5-gallon buckets at Basspro.com.
I recommend Arm & Hammer Cat Litter as it helps eliminate odor.
Don't mix urine and solid waste as that makes for more odor. Have a “toilet” for each. Add a tiny amount of Pine Sol to the urine to prevent urine odor and the Arm & Hammer cat litter to cover solid waste each time that potty is used.