The Charcoal Companion Moistly Grilled grill humidifier is a two-piece cast iron vessel that goes into the grill. Simply fill it with water—or wine, juice, soda, stock or any other flavored liquid—to add humidity to the grilling environment as you cook. The result is juicy, flavorful grilled meat. Includes two cast iron vessels with vented lids; each vessel measures 11.9 by 1.8 by 1.7 inches.