Help! Just found a baby squirrel! What do I do with him?

I just found a baby squirrel in my house…he is curled up and shivering. He looks to be about 6–8 weeks old. It’s fairly chilly outside and I don’t think his mama is around. Has anyone had any luck with a baby squirrel? I’ve got him wrapped up in blankets with a warm water bottle next to him. Is it possible to hand raise a squirrel? I’m thinking I need to go run and get some formula for him. Anyone have any advice?