MAKE A SOLAR STILL.
I’m intrigued by the possibility of a parabolic cooker/still. All you need is relatively stiff paper (almost cardboard stiff but not quite).
Cover with aluminum foil, shiny side up, and rill it into a cone shape. Cut a hole in the bottom and it will focus the sunlight.
Ever use a magnifying glass and shine the sun on an ant? Same deal here. Concentrates the sunlight possibly hundreds of times! DO NOT stick your hand in the opening!!