Found this chick at my house last night

I live in a suburb that allows chickens and goats. Not sure which house this came from. I only hear roosters, not sure where they live. I took it to a feed store today to get food, and the lady said looks about 3 weeks old. It's warm here, but what do I do at night? Can't come in I have parrots and scared of bird flu. Can I just have 1 chicken, or will it need a friend?