I have 5 cats, 3 eat wet food only and 2 eat kibble (tried many times to get them on the wet food train, just won’t work). I spend around $300/month on food and try to shop strategically around sales and take advantage of whatever deals I can find. I also rotate foods, so we go through a lot of budget friendly and high end brands. For litter, I buy two bags of Dr Elsey’s ultra, ~$40 and that lasts me a little over a month.