Signal For Help
Survival guru Tony Nester suggests tying a bandana or shoelace around the bottle’s neck, then hanging the bottle somewhere elevated, like a tree branch. The key is to get it off the ground, so you expose more surface area and maximize glint. This passive signaling method also frees you up to perform key tasks like shelter-building. Any shiny object will work: bottles, mirrors, space blankets, hubcaps, bike parts, even a machete.