I've done some searching for the "liquid form" construction requirement for pliant gloves (Ultimate Equipment), but with no success. The only thing I can find which is called that is a spell-like ability of the Water Yai Oni. It seems unlikely that only a Water Yai Oni was intended to be able to meet this requirement.
The liquid form ability that the Water Yai Oni has is a variation of the "gaseous form" spell. Should the pliant gloves requirement referred to that instead (which is to say, is this an editing error)?
Thanks!
Andrew