An alternative that I use, especially if I want a smoke flavored side but not necessarily the main, are Cameron's smoker bags.  These have flavored wood chips inside and you can seal the dish in the bag a put it on the grill or open fire to cook.  Things come out juicy and tasty with the easy alternative.  As a side note they can be used inside in the over as well.  We have used them for fish, vegetables, and other items with great success.