Bottomless Stomach

When you cast this spell, you gain the ability to
consume dangerous substances and contain them in an
extradimensional reservoir in your stomach. The spell
allows you to swallow most liquids, such as acids, alcohol,
poison, and even quicksilver, and hold them safely in your
stomach. You are unaffected by swallowing the substance,
but the spell doesn’t give you resistance or immunity to the
substance in general; for example, you could safely drink
a bucket of a black dragon’s acidic spittle, but you’d still be
burned if you were caught in the dragon’s breath attack or
if that bucket of acid were dumped over your head.
The spell allows you to store up to 10 gallons of liquid
at one time. The liquid doesn’t need to all be of the same
type, and different types don’t mix while in your stomach.
Any liquid in excess of 10 gallons has its normal effect
when you try to swallow it.
At any time before you stop concentrating on the spell,
you can regurgitate up to 1 gallon of liquid stored in your
stomach as a bonus action. The liquid is vomited into
an adjacent 5-foot square. A target in that square must
succeed on a DC 15 Dexterity saving throw or be affected
by the liquid. The GM determines the exact effect based
on the type of liquid regurgitated, using 1d6 damage of the
appropriate type as the baseline.
When you stop concentrating on the spell, its duration
expires, or it’s dispelled, the extradimensional reservoir
and the liquid it contains cease to exist.