Well, I will admit I have never made a passion fruit wine (living in Napa, those pesky grapes just seem to be the most convenient sugar source at hand) but I will give you what advice I can. Passion fruit (or Passiflora edulis) is a popular worldwide flavor. The fruit is eaten in desserts and salads and the juice is made into popular juice drinks and cocktails. Its acidity (pH range 2.8–3.2) and low sugar content (15 Brix +/-) are the main winemaking challenges you will face. You will have to dilute your concentrate and add some additional sugar in order to target a pH 3.3 or above as well as 22–24 °B. Adding water will do a good job of bringing your acid levels down though because I don’t know the concentration of your bottle, it’s hard to say how much to add. That’s where your handy hydrometer can come in. As far as fruits to add, I would go with something lower acid (like apple juice) or even red grape juice (or concentrate), which will benefit your fermentation
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