At the campsite: Add water to bag containing dry ingredients. Squish bag gently to mix. (This is a good job for a responsible kid.) Place butter in pot over campfire, allowing pot to heat up and butter to melt. Pour batter into melted butter, then drop fresh fruit on top of batter. Place a small mound of hot coals (about the size of 6-8 charcoal briquettes) into the inverted lid or the skillet, and place on top of pot. Nestle pot into very hot coals at the edge of the fire — coals should be snuggled up against the sides of the pot. Make sure you have a pot handle and oven mitt at the ready — cooking with fire may require some shifting and adjusting of the pot to keep the heat even. Plan to lift the lid to check the pie from time to time. Bake until batter is done and the top of the pie is a golden, crusty brown. Visual cues to doneness are more important than cooking time. Cooking time can vary greatly, but will likely be 30 to 45 minutes.