When considering using a plastic container for a rain barrel, it is important to assess its suitability for this purpose. Not all plastic containers are created equal, and some may contain chemicals that can leach into the water and potentially harm plants or animals. It is recommended to use food-grade plastic containers if collecting water for drinking purposes. Alternatively, there are other options available such as repurposed wine barrels or metal drums. It is important to note that trash cans should not be used, especially if they previously contained hazardous materials. Before using any container as a rain barrel, it is recommended to clean it thoroughly and rinse out any plastic residue. While it is possible to modify and use any large plastic container, it is crucial to consider the safety of the water collection and potential harm to the environment.