I'm getting ready to make a couple kegs of flavored hard seltzer for a weekend party. I'm looking for a simple, syrup-based recipe for 5 gallons. Tourani syrup seems the most likely syrup, since the people want black cherry and they have that. But I have no idea of the syrup:water ratio. Force-carb, vodka, etc etc are all fine. But does anyone have a simple recipe with a syrup:water ratio?