Every cat owner needs to buy cat food in addition to treats and anything else to keep your cat happy. Since you’re spending so much buying food for your cat, you might want to consider investing in companies that cater to the cat owner market.
By investing in cat food companies, you can at least earn back some of the money you’re giving those companies anyway. If the cat food companies do well, you can then use those profits to buy more cat food so you don’t have to spend the money out of your own pocket.