Cat Canned Food Question?

Ok so there has been a set back. Money is SUPER tight right now and will be for about a month. I am out of catfood and cannot afford to buy the top of the line food for my kittys this time. I noticed that 9 lives has a "Growing Years Food" for ages 0-3 which is what my 2 cats fall between. Could I feed them that and moist food until I get back on my feet or should I feed them Whiskas or something like that. Purina maybe? Also, what canned food can I get from the grocery store that I can feed them that is pretty good. Please remember this is only until I can get back on my feet. Thanks in advance.