Too many bodies. Just throw some gasoline out there and light a match.
You want diesel and kerosene to burn bodies, gasoline will evaporate too fast and you'll only burn the fumes.
You can light gasoline poured on anything and it won't be burned.
If you want to make sure, like if you're in Bosnia and it's wintertime and you're near a lake, cut the body up, soak it with diesel and kerosene fuel, use flares to set it on fire, it will burn for hours and get hot enough to burn any DNA or even recognizable parts of a human.
Now, if you want a faster fire, use acetone to dissolve and soak, you need something else than plastic to contain it though because acetone dissolves all plastics, use glass bottles and injections along with pressure to get it inside the bones and you got yourself a bomb, it will literally explode when ignited because of the containment and the end result is not unlike napalm in that it's sticky as it dissolves the protein and extremely flammable.
Something to think about when you roam the icelandic outbacks i guess.