A healthy adult bladder can hold up to 16 ounces (2 cups) of urine comfortably, according to the National Institutes of Health. How frequently it fills depends on how much excess water your body is trying to get rid of. Circular muscles called sphincters close tightly to keep urine from leaking.
A very small bathtub might hold 40 gallons, while a larger single person bathtub could easily hold 100 gallons or more. My bath tub holds 110 gallons (pictured above), and my 50 gallon water heater couldn't even fill it with enough hot water to use the whirlpool jets.
Water is one of the most common dream symbols and is usually associated with the emotions and the unconscious. Large bodies of water (ocean, lake, pool) usually represent the unconscious itself. ... To be underwater may suggest you are feeling overwhelmed or you are in over your head emotionally or financially.
Being suspended in deep water suggests a state of being emotionally “in limbo.” Falling into oceans and other large bodies of water, similarly, is a metaphor for being in an emotional “free-fall.” ... Next time you have a falling dream, recognize it as a sign that you are feeling emotionally overwhelmed.