Additional tips:

Experiment with different essential oils to find your favorite scent.
You can also use this easy DIY fragrance in other rooms of your house, like the bedroom or closet.
Make sure the bowl is out of the reach of children and pets.
With this simple trick, you can keep your bathroom smelling for a week without resorting to expensive commercial air fresheners. Your guests will surely want to know the secret when they enter your scented bathroom!