@Rincewind Rabbits usually like to just have hay in their litterbox. Some people just put it straight in their litterbox on top of their litter, some people get racks or feeders that can hold the hay near the litterbox but try to keep it out to reduce the amount of hay lost to being peed on.

For litter, paper based litter like CareFresh is generally preferred.

As far as dishes, I've never seen them have much preference on shape. Heavy, smooth, or otherwise hard to pick up dishes are best, as otherwise rabbits will pick them up and fling food all over the place.

A rabbits diet should be mostly Timothy hay, plus a small amount of a high-quality rabbit pellet like Oxbow, plus some greens. Very small amounts of fruit can be good as a treat.

@Rincewind I use a no-tip bowl like this for their water, though I remove the rubbery part around the rim as they'll just chew through that.

And I just use a ceramic cylindrical pet food bowl for their pellets, also heavy and smooth enough that it's hard for them to pick up (though they do occasionally manage to flip it). And just a ceramic plate from the thrift store for greens.