You could put posters in the containers, that explains what should be thrown in each container.
You should use lunchboxes instead of aluminium foil.
Justification
1. You should reduce waste because, there are 5 marin animals that are dying for the plastics thrown in the sea. The animals are: turtles ,sea lions ,seabirds, fishes, whales and dolphins.
2. You should reduce waste because nowadays people is throwing a lot of waste , in the sea etc... Maybe in 100 years there will be more waste than nature in the world.
3. Two out of five people throw plastics in the sea.