There's no carpeting in Bohol, which is why I came up with canvas. We have cardboard coming out of our ears (which can be painful).
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On youtube. I saw one made using two plastic tubs. The slightly smaller tub had many, many holes drilled in it, so the pee could run down into the larger tub. The smaller tub which held the litter high and dry.
I change the litter, what? Twice a week? Twice a month? --Thinking back, I've never owned a litter box.

We always had indoor/outdoor cats when I was growing up. As an adult, most of my landlords didn't allow pets.

I could have had them in the last place I lived, but we bordered a gigantic park which had coyotes.
Ideally you would be using clumping litter, which means there shouldn't be any urine running anywhere (or at least not that much; it will if you neglect to change the litter in a timely way since it can only absorb so much). Clumping litter means that when the cat pees, the urine turns hard and lumpy, and you should be able to scoop it out and put it in the garbage. NEVER PUT CAT LITTER IN THE TOILET. IT IS NOT FLUSHABLE AND YOU WILL END UP WITH PLUMBING PROBLEMS.
I use
Arm & Hammer cat litter (though I'm currently trying out the store brand from the place where I get my groceries; she seems to like it okay). The boxes come in three sizes: 6.4 kg, 12.7 kg, and 18 kg (sorry, I have no idea how much that is in pounds/ounces). Whatever you use, keep in mind how much you're comfortable with lifting, as you'll need to lift it to pour it into the litter box. Cat litter is
heavy. I buy the 12.7 kg size of litter and have my housekeeping helper transfer it into smaller plastic pails so I can carry and move it around myself as needed. I use cheap plastic bowls to scoop the clean litter from the pail to the cat's box.
Of course that system is just what I can manage. You should experiment and see what works for you. Just mind your back and don't try to lift this stuff if it's giving you problems.
You'll need a couple of plastic scoops, and you should be scooping daily (using clumping litter will make this much easier than non-clumping litter, and clumping litter means there's much less odor). Most people, from what I can tell, scoop daily (as often as needed; twice isn't too many) and completely change the litter weekly.
Of course this is a suggestion. Your cat's mileage may vary, depending on what kind of litter you have, what kind of litter box, how often the cat goes, and how "productive" they are (there's a reason it's referred to as "doing their business").
Keep in mind that if the cat considers the box too smelly, too small, or doesn't like the litter, (s)he might decide to go somewhere else. That's why daily scooping and weekly complete litter changes are what many people prefer. But let your nose be the guide. If you notice the smell, the cat will have already noticed it.
A litter mat in front of the box is a good idea. Cats can get dust or little clumps of litter on their feet, and of course when they wash, they'll swallow this. To keep the cats healthy and lessen the chance that litter will be tracked around the home, a mat can trap this litter and keep it from getting where it shouldn't. Mats are a good idea for another reason, too. Some cats like to kick litter around, and it's best to get it on a mat that is easily hosed off than on your rug or floor.
Some people keep the litter box near the cat's food dishes. I shudder at that, since any litter that might get into the water will make the cat sick, or possibly burn its mouth when it drinks. So do keep the litter box and the food/water in separate rooms.
This is the litter box I use (and now that we're talking about it, I realized that I'm going to need to get more liners soon).
Liners might seem unnecessary and wasteful, but they save me a lot of work, as I don't need to wash the pan itself as often (you do need to clean and disinfect them every so often). When it's time to change the litter, I just put the whole linerful of used litter into the garbage, give the pan itself a quick wipe if there have been any 'accidents' or if Maddy's claws have ripped the liner, put in a new liner and litter, and presto, she's got a clean bathroom again.
Another thing to remember: ALWAYS wash your hands after either scooping or changing the litter box. Even if your hands don't physically touch anything, some kinds of litter are dusty and you can get it on your skin. Personally I use gloves when doing litter box stuff - and wash besides - but that's me; I'm fanatical about hand-washing. Just so long as you don't forget this, as it's important.
Oh, and regarding storage of clean cat litter: If you store it in a pail, always keep a lid on it. Otherwise the cat might assume it's another litter box. We learned this many years ago when my dad decided to put the clean litter in an ice cream pail. My cat looked at the pail, climbed up into it, looked it over, thought, "Well, it's a bit on the small side, but I guess it'll do," and proceeded to use it.
Another "oh, and...": Don't make the cat climb or jump up to use the litter box. The more effort they have to put into it, the less likelihood they'll use it. Cats, like humans, prefer their bathrooms to be as effort-free as possible. Maddy just steps in and out of hers, and I keep it in one of the back rooms so she has privacy.