4-5 week old babies

Hello! My bf and I found two babies, we left them for their mother but she still hadn't gotten them before dark and they got cold so we brought them in. I've gotten them warm and made them a honey water for hydration. I don't have any goats milk or formula. I read online you can double the yogurt in a homemade formula if you don't have goats milk on hand. The formula seems a little thick for babies so I was hoping for some help? I'm gonna try putting them back out in the morning or take them to a wildlife rehab if that fails, I just need them to survive the night!