There is this one show on the food network called licence to grill and he just puts wood chips (dry and wet) in a foil pack and then in his bbq... does this require a special bbq? I have just a regular propane bbq that I can remove the grate and put a tray down and not have it effect the flame. Also where do you buy the chips of wood from?

Wal Mart sells the chips. Many places that sell charcoal sells them