Eldritch Stream

The Caster unzips or pulls down their pants, using their genitals to spray acidic urine at a 45-foot range. The stream shoots at a straight arch and hits a single creature. The target creature must make a dexterity saving throw. On a failed save, the creature takes 2d6 acid damage and is stunned. On a successful save, they take half the damage rolled and are not stunned. 

The spell is continuous and will continue for X rounds of combat. X being how much of liquid the caster had consumed before casting this spell. This is determined by a value of cups of beverage drank. One cup drank will equal to 1 round of combat (size of cup does not matter). Furthermore, the spell will last for as long as the caster wishes to use it or the spell is interrupted. The caster can attempt to extend the spell's duration if they use a bonus action to drink a beverage in their inventory.

Note: For female casters, they will need to use some sort of funnel device in order to shoot the urine outwards. That or do it with their hands or pee like a dog if desperate.