Taste it first. If you think it needs to be more sour, then go ahead and add the acid. Since it's a kit, you'll probably need to add the acid.
Fermenting: Blackberry Wine
Aging: Mulberry Wine, Mint Mead, Dandelion Wine, Mesquite Mead
On Hand: Peach Mango Wine, Huck's Cider, Mulberry Mead, Orange Spice Mead, Cyser, Apfelwein, Maple Cinnamon Mead, Hard Cider, Brown Sugar Cider