I wouldn't bother doing the upside down ones - they are a gimmick. You can get bush variety tomatoes which will grow in a pot well and produce lots of fruit without support or space requirements.
I don't know about that - I just used a normal flower hanging basket, and put two small plants per basket, they grew amazingly upside down, and were easy to both water and harvest. Saves having to support the plants as they grow, and frees up floor space. You don't need a special bucket though.
