Feline Pine. It's flushable (in very small amounts), bio-degradable, and natural.

You only need a little because it expands when it gets wet. It also makes it easy to clean the box because you can SEE where the cat has soiled it.

Those self-cleaning litter boxes are TERRIBLE. They're crazy bad for the environment because of all the waste they produce. Please for the love of god do not get one of those.

I'm not going to go into what to feed the cat because I believe in all natural diets. All of my animals are vegetarian (like me) so that I don't have to provide meat. The only exception being the snakes (obviously). They all get nothing but fresh fruits, veggies, grains, etc. No store-bought food for me.