Suiko

The Suiko (水蠱 lit, Water Mushi) is a liquid Mushi.

Description
The Suiko is clear and colorless. It is found primarily in old water veins, ponds, and even in wells.

If one mistakes it for water and keeps drinking it, he/she soon won't be able to breathe without being in contact with the Mushi, and will start to turn transparent. Eventually their body turns into liquid and flows away.

Some other effects on coming in contact with a Suiko is that one's hair turns earthly green as witnessed in the case of Io.