Urine
Water the body has filtered and is releasing — the unglamorous, necessary discharge of what was already used.
Urine in a dream is the dream's image of the unglamorous, necessary discharge of what was already used. The body keeps what it needs and lets the rest go; the act is private, regular, and not an emergency. The dream brings urine when something in your life — a finished argument, a draft thrown away, a relationship ended — is at the stage of needing to be let go in the ordinary way. Urine passed in a private place is the dream affirming that the discharge is being done as it should be. Urine that comes in public, against your control, is the dream noting that what you meant to let go privately has emerged where everyone can see, and the embarrassment is part of the meaning.