Hello how may I help you? How much space do I need in my apartment for a cat? Alright, I can answer your question about how much space you need. For a cat you would need at least 400 square feet. I think I have that. What else should I get Litter boxes, litter, food, food dishes, toys, a grooming brush, a name tag and collar are all necessities for a new cat. For a more complete list, visit the ASPCA website. Can I get those all a t any pet store Yes. Do you know how much it might cost It varies on the quality of items you purchase, although you can expect to spend at least $50. That's not too bad. Thanks You're welcome!