In a bowl, mix the kosher salt with the water until it is the consistency of moist sand. On a parchment paper–lined baking sheet, mound one-fourth of the salt slightly larger than the fish. Lay the fish on the salt and fill its cavity with the bay leaves and lemon wedges. Poke a short skewer into the thickest part of the fish, just behind the head. Pack the remaining kosher salt over and around the fish to enclose it; leave the skewer visible.