Take an empty 2.5 gallon water jug. Stand on end. Cut the top off. Cut holes (narrow slices work best) in the sides. If you have them, put sticks (bamboo skewers work great) through the sides too. Toss a handful of playa dust in the bottom.
After meals, toss random bits of food, from strawberries to chicken bones, in the food dehydrator. I was amazed at how fast this stuff dessicates in the desert heat. The playa dust is part of the key, as it is hygroscopic.
At the end of the week, my small camp (two people) had NO SMELLY FOOD TRASH AT ALL. Applecores, meatballs, macaroni, strawberries...it was all dried crunchy unsmelly (insert noun here.) And we never choked the firebarrel with huge nasty gobs of wet nonburnable trash.
This is from an acquaintance that I was in the same theme camp with a couple of years ago. I personally haven't made one yet, but he's an experienced veteran (and NASA rocket scientist to boot), so I trust he knows what he's doing.