Fill the bathtub with warm water
Add 1/4 to 1/2 cup of liquid castile soap or mild body wash under running water
Swirl the water gently to create bubbles
Add 1 to 2 tablespoons of glycerin for longer-lasting bubbles
Pour in a small amount of bubble bath solution if desired
Mix the water lightly with your hand
Adjust the amount of soap for more or fewer bubbles
Step into the bath carefully
Refill with a little more soap if the bubbles fade