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It does not heal you immensely, it just gives allies the constitution bonus.
This is not a "heal" in the strict sense of the word, but it can function as one. The extra HP granted by the constitution bonus will remain when the effect expires (up to a character's maximum HP without the constitution bonus) . If characters with Water of Life take no damage, then the extra HP will have served no purpose.
Example - 1000/1000 HP character receives Water of Life. HP increases to 1400/1400. Character receives 500 damage over 4 turns. Water of Life Expires. Character now has 900/1000 HP.
Example 2 - 500/1000 HP character receives Water of Life. HP increases to 900/1400. Character receives 200 damage over 4 turns. Water of Life Expires. Character now has 700/1000 HP. (Note: numbers chosen are arbitrary and do not reflect exact HP values additional constitution will bestow on your characters.)