I would go out an buy some food for the kitty. Maybe some hard crunchy food, and some soft food.

My grandmother has been feeding strays for about 8 years, I believe. That's the reason she "adopted" and took her current 3-legged cat, Trey. And now, she has 3 "kittens" (they were born in June of last year, but still) inside, too. And right now, there's another litter of kittens that're younger that want inside. She's slowly letting more and more in, because they're socialized and such. There's a mama kitty that has had 8-9 litters since she's been there, but no one can catch this cat unless she's pregnant. So, there's still a no on that one. But, my point to this: she buys TONS of kitten/cat milk, cans of food, hard food, treats, etc., and gives them breakfast/lunch/dinner everyday. They're such lovely cats.