OH! It dawns upon my that I could mention who/what I feed the foster cats. (DUH) They eat totally separate.

They get a real variety. I try not to spend a whopping amount of money on their food (and I try not to ask for all their expenses to be reimbursed by the rescue group). So the first thing they get is whatever has been donated. And yes, most of that is grocery store type food. I try to mix these donations with something better. I check for sales and coupons for middle of the road pet store types. One of their favorites is Eukanuba Lamb and Rice (and the ONLY food I could get Simba to eat. )

So far all the fosters have done fine on it, but for many it is not for an extended period of time (as they move on).

I would like to note that MANY cats can live a perfectly healthy life on Purina. As with all things, it just depends on the cat.