This idea has a different approach as my first entry. Instead of one hole , 2 holes have to be made in the roof. The base of the product has a roof tile shape for easy fitting. It also has an integrated support shape for the bottle and solar panel.
The round hole in the roof is for the bottle and the square hole is for the batteryholder which is placed below the solar panel. In this way a wire/rope can be used for swichting the light on and off.
The LED unit is a loose part which is connected by wire to the solar panel and which is screwed to the bottle.