Bezoar Armor

Armor (light, medium, or heavy), rare, requires attunement

This armor looks mundane except for the black stone embedded on the front. The armor makes you immune to all poisons. Furthermore, while wearing the armor, you (and only you) may detach the stone and place it in a cup of water for one minute, which transmutes the water into a powerful elixir — anyone drinking the elixir will be cured of poison.

Detaching and attaching the stone requires an action. While the stone is detached, you will not be immune to poison.