How do I catch drippings on a charcoal grill? It's time for me to buy a charcoal grill. I am looking into the Weber 22.5 inch. 

I hope I will be able to use it to get smokey flavor as well with Alton Brown's "wood chips in aluminum foil method".   

However, I am worried about durability. Since the the shape of the grill is cylindrical, I suspect I am going to have a hard time catching drippings effectively. Most dripping catchers are rectangular. 

How does one go about solving this? I am thinking of just using aluminum foil, but I am afraid that it might melt.
The melting temperature of aluminum is 660C/1220F. It's extremely unlikely your grill will ever achieve that temperature. 

Although a rectangular pan doesn't fit a cylinder very well from a geometric perspective, in practice on a grill it fits just fine. Your food is rarely circular in shape either, after all. The Weber grills have a very good reputation as smoking/grilling devices. I wouldn't hesitate.