d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Water of Life [USEFULNESS] I recommend that you wear this charm only if you do not have any better solutions concerning health regeneration. [BONE CHARM PROPERTY] 
Drinking tap water results in health bar being slightly regenerated.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY