I have never worked with water mellon before I used five medium watermelon five pounds of strawberrys that I juiced one can of frozen apple concentrate one can pineapple concentrate one white one regular cans one concentrate and about three and a half pounds of sugar, it had a potential of making 10% ABV and has been fermenting well I also added yeast nutrient and yeast also used camden tablets and let it sit 24 hours before adding my yeast and nutrient.