You don't have to use fruit, but using natural fruit adds a bit of variety and authenticity to your drinks. Fruit flavors are far more complex and subtle than those found in bottled juice or syrup concentrates. Real fruit provides much better taste, natural sweetness, and extra nutritional benefits. If you would rather not mess with fresh fruit, then store-bought juice works well too. Sometimes it may be necessary because certain fruits may not be available year-round, depending on where you live. However, keep in mind that these store-bought juices usually contain added sugars, preservatives, and artificial colors. But remember that once opened, these bottles of pre-made juice must be refrigerated immediately to ensure safety and quality.