Build a fire and let it burn down until you have a few flames and a solid bed of coals. Place grill over coals and let the grill heat up for a few minutes. Using your hands, firmly squeeze out all the liquid from the spinach. Mash together spinach, cream cheese and garlic (and any other optional add-ins), and season to taste with salt and pepper. Wrap in a foil packet, making sure the edges are well sealed.

Place the foil packet on the grill and cook until you begin to hear the packet sizzle, about 8 minutes. Move packet to a cooler portion of the grill and let cook for another 5 minutes. Carefully open the package and serve with bread or crackers.