def favorite_drink():
    drink = input("What is your favourite drink? ").lower()

    if drink == "water":
        print("What an excellent, healthy choice!")
    elif drink == "coffee":
        print("Careful... not too many cups, or you'll go nuts!")
    elif drink == "goat milk":
        print("I've never heard of that!")
    else:
        print("Hmm, that's an interesting choice!")

favorite_drink()