Not exactly a trail fix, but. Many years ago heading to Lake George on the Northway at about 0200 we over heat. Pop the hood, and there's the radiator cap sitting on the air cleaner. My buddy did the under hood checks topped up coolant got side tracked and forgot to put the cap back on prior to the trip. We sat around for a bit, let the engine cool down and topped it off with water from the cooler, and Molson red label ale. After the vacation, we flushed the cooling system and refilled with the proper coolant.