Yes rabbits will use a litter box. I have had rabbits for about 10 years. Long before I had my kids. I have 2 mini los with loppy ears. They are great with kids cause they don't bit, but they will nibble on the finger if they hungry.
You can get supplies or food at your local pet store or feed store. You can do a goggle search for feed store and will have several in Ft Worth I believe there is Russell feed store.
You will want to use Aspen litter it is the best for small animals and will not harm them. Cat litter there is too much dust and they breathe that so much because they are in the cage. Where cats do there thing and leave.
If you want the most for your money get your pet food and litter from your local feed store store. You can get a real large bag of aspen at the feed store for about the same price as a small bag from the pet store; and the same with the food.
We got a large plastic rubbermaid storage container and we get a large bag of aspen and store in the rubbermaid storage. The feed store will carry a large bag of rabbit food and it will last a long time is cheaper and better quality.
Most will carry show rabbit or purina it is the best ones.
My kids love going to the feed store so they can see the animals for sale like the fish and puppies.
Usually either place will carry litter boxes. I do recommend replaces the litter box probably once a year if need be.
I use the large corner litter box for rabbits. It is in the rabbit section of the pet store. The corner litter box is easier to get in and out of the cage than the square box.
I put the aspen in the litter box and they will start hoping in and using it. As it gets full we change it about 2 a week.
I save those grocery bags and I dump the littler in a plastic grocery bag and tie it up and goes in the trash on trash day.
It is one way to recycle those bags!
Also you show feed your rabbit.Timothy Hay is healthy for proper teeth wear because of the chewing action (rabbit teeth grow constantly). Plus, timothy hay can make a rabbit feel full so he may not chew everything in sight like your computer wires!
Alfalfa hay is very rich in nutrients and calories! House rabbits can get fat on alfalfa hay. Timothy hay is better than alfalfa for this reason.
I put a handfull of hay on top of the fresh box of litter and
they will hop in and start eating. This will also get the rabbits to go in the litter box.
Rabbits like to play as well as cats. There are cat and rabbit toys available now. This is a great way kids interact with the rabbits.
I have a 3 yr old who grown up with the rabbits and they love to feed the rabbits there carrots. I give her some carrots and she goes and sits down and puts the carrots in the cage one by one. She also learned what carrots was the color orange by doing this and is one of her favorite thing to do.
Sometimes I let her do this when I am cooking dinner for something for her to do.
Sorry this is long was trying to think of things to help.
Feel free to send a msg if you have questions. I am not a vet but I can share my experiences.