Here’s how to do it: Funnel three inches or so of lamp oil into the empty bottle. Insert a 3/4-inch fiberglass wick; trim it so a half inch emerges from the mouth. Rest a 1 1/2-inch washer with a half-inch opening atop the mouth, and thread the wick through. Make sure the wick stays exposed a half inch above the mouth, and never leave your new oil lamp unattended. Let there be light.