You need a broody box set-up with a light. Globes are hard to get these days, as the energy efficient ones are no good, you need the older style, but even those don't put out as much heat as they used to. It is best to spray paint them black, but you need to leave them on for a few hours to burn off the chemicals before putting them anywhere near the bird. The other option is a set-up using a clay flower pot to radiate the heat. For now a hot water bottle would work, especially in an insulated box, like a styrofoam one. Just keep on checking it. The other option is some kind of heat pad, the pet store may have one. I would see first if it survives overnight before doing to much though.