Complex sentence: Since the word, more or less, implies drinking coffee, just having a sandwich would not really be "fika", although tea is also common, and young people may have lemonade, a soft drink, or milk, instead of coffee.
Split into simpler sentences: Since the word implies drinking coffee, just having a sandwich would not really be "fika". Drinking tea, however, is also common, and young people may have lemonade, a soft drink, or milk, instead of coffee.