I know this is of no use, but I attempted watermelon wine, after 3 months it was not looking to good, and the liquid was super thick, I ended up discarding it
#14 (ish)lb watermelon cubed up
#10lb strawberries
#10lb sugar
water to 5 gallons
1/2tbls Nutrient
1/2tbls Energizer
Montrachet Yeast
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Cubed watermelon and put in a nylon bag and put in primary. Put all juice from cutting into primary also.
Halved the strawberries and put in a different nylon bag and let sit.
Dissolved the sugar in ~1-2gallons of water.
Added water, nutrient, energizer to primary
Used some of that solution to do a starter of the yeast and pitched when bubbly.