Best cat food

I am caring for a colony of 10 ferals. Half of them are males. Everyone is 'fixed'. I want to feed a decent dry cat food (I also feed wet food in the morning), but I want to know what the best grocery store cat food is that is low in phosphorous...to avoid urinary problems with my males. Any advice on the best grocery store brand?

Not sure where you are located but in Australia the best supermarket one is grain free Applaws (chicken variety). Not sure on the phosphorus though. Everything else is rubbish unfortunately (at least over here).