I suppose the answer will depend on where you live and the quality of the materials you want to use. Because this is a permanent structure and sits underground, I am more inclined to buy the type of basin that is made for this use. A plastic bucket could easily crack and leak and you'll have to take the whole thing apart. And, if you live in a colder climate like I do (Pennsylvania), the ground will freeze and will likely cause a regular old bucket to crack. Pond basins are flexible and won't crack over the winter.