The concept is so simple that it doesn't need much explaining
El projecto es tan simple que casi no necesita explicación
What do you need : 1 plastic soda bottle and 1 plastic 5l container, both clean of course. And some wire.
You can do everything with a very pointy and sharp knife, but preferably use :
1. your sharp knife 2. a hacksaw 3. a wire cutter 4. a drill for metal