To convert fluid ounces to gallons, we need to divide the number of fluid ounces by the number of fluid ounces per gallon. Using the conversion factor 1 gallon/ 128 fluid ounces, we get:
1,408 fluid ounces ÷ 128 fluid ounces per gallon = 11 gallons
Therefore, 1,408 fluid ounces of water is equivalent to 11 gallons of water.