Rain barrel is extremely useful to save water and money. Obviously it is not suitable to drink. But you can do many other ways with reserved rain water; such as water the garden. Rain water barrel is easy to make, and according to the videomaker even a child could do it. Check out the video and make your own 110 gallon rain barrel by simply using two 55-gallon plastic drums (or used plastic barrels).
In any case you don't want to bother yourself making a rain barrel, yet you feel the need to have one, simply order a ready-made rain barrel here.