TruckerDad, I justg attempted watermelon wine last weekend, and after an explosive start, it is now happily bubbling away. Making wine with whole fruit of any kind poses several extra challenges, namely:
-Sanitation of the fruit itself
-Processing the fruit, and getting an accurate hydrometer reading with the fruit goop in your fermenter, hence not knowing how much sugar to add to hit ideal OG. Also because sugar content will vary between individual fruits of the same type
-Fruit goop WILL tend to clog airlock or blowoff tubes, leading to a fruit geyser painted up your wall/ceiling and usually an angry spouse, which can hurt your chances of being able to make more wine in the future.
-Cost: It takes about 3-5lbs of fruit per gallon of wine, so if you are trying to do this on the cheap, unless you know someone who has a tree/bush/patch of it, costs add up quick
-Loss of volume, whole fruit will expand in wine, and displace alot of liquid. Blended fruit will form a cake on the top and bottom. So in either case, you will lose significant volume once you rack off the goop ( over 1 gallon out of a 5 gallon batch) which makes it even less efficient.
According Wine guru Jack Keller, who knows much more than I do about such things, Watermelon juice specifically poses several additional challenges:
-It spoils quickly, so you run the risk of some other organism taking off before your yeast can get established.
-Its flavor is relatively weak, making a bland wine lacking in taste if you use much water in the recipe, so you will need ALOT of watermelon to make 5 gallons of juice. For my Watermelon wine, it took three MONSTER melons to get 6 gallons worth of juice, at $6 each, and was time consuming fairly expensive and quite messy to blend them all up.
Im not trying to say don't make wine from Watermelons, or any other whole fruit, just perhaps not for your first batch. Fortunately, there is a VERY easy and inexpensive way to get that first batch under your belt (and make some VERY tasty wine:
Use this recipe
http://skeeterpee.com/recipe
This is for Lemon wine, and you can buy the raw ingredients at the grocery store.
Great way to get started
Only thing Id add to the recipe is also buy a half gallon of any 100% juice (pick a flavor that you like) at the store, and some larger balloons (to fit over the mouth of half gallon)
Create a starter 2-3 days before you mix up the skeeter pee:
-Open the juice. Pour yourself a glass of it and drink it.
-Put your EC-1118 yeast and a little bit (1/2 tsp or so) yeast nutrient into the juice jug, recap tightly, and shake vigorously. Remove cap and put one of the balloons over the mouth of the jug. The balloon will inflate when your starter takes off.
Pitch that starter onto the wine after it sits for 2 days (so starter will have been going for 4-5 days by this time)
you can make a 6 gallon batch of skeeter pee for under $30 all in, and it will get you used to the steps in the winemaking process. Its how I started, and I HIGHLY recommend it to anybody else trying winemaking for the first time, especially on a budget. Take notes and record your hydrometer readings.
Provided you let it clear and follow the directions, this will be ready to drink the day you bottle it (most wines need to age for months to be optimally drinkable). I regularly can do a batch of Skeeter Pee in 6 weeks from brew day to bottling, so fast turnaround
Even with all the whole fruit wines and meads that I make, my Wife's favorite wine (commerical or homemade) is still the mixed berry skeeter pee i make for her. You will love this stuff! Let me know if you have any questions, I am all about making wines on the cheap from grocery store ingredients