Sqirrel Sticks work pretty well. When I was a kid we would do that out on fishing trips. The best for light weight camping is to drop a few stones, about 3/4" high in the bottm and put just enough water to cover the stones. Then simply cut the fish in half, and drop him in the pot with the lid on. Steam Baking it is refered to as. Poaching is boiled fish just till he is cooked to 160F or so. Kinda hard to judge so I usually let it go longer. Aluminum foil works, over a fire. Season with whatever you like. Lemmon, salt, pepper, a bit of oregeno, and, terragon. Wild wintergreen in small ammounts works pretty good.
Pics are jpg or CGI format.