Trying to repair a small leak in my inner tube with Slime tire sealant. Got my buddy to pick up a bottle at the local Canadian Tire, but unfortunately he got a bottle that was missing the valve core removal tool. Here I am now stuck with a bottle of Slime and a flat tire with no way to unscrew the valve. Are there any tools i can use to remove this that may be lying around the house? I will return the bottle to Canadian Tire when stores are open tomorrow, but would rather get it fixed today if possible.

edit: It appears to be a Schrader valve