These easy blueberry cocktails are a perfect summer drink. Start by making a simple blueberry syrup with fresh berries, sugar, and water—feel free to swap in strawberries, blackberries, raspberries, or peaches. Mix the syrup with a splash of whiskey (or vodka, gin, or a nonalcoholic spirit) and fresh lemon juice, then top with tonic water for a light, refreshing spritzer. Easy to scale up, this recipe is great for entertaining a crowd.