Purified water

Purified Water is (as the name suggest) water that is completely free of radiation and so it can be safely consumed without harming the player. In addition, it also heals for a more then Dirty Water does by awarding 20 Health instead of 5. It relatively rare as in the Wastes, but can be requested by Wadsworth, the robot that takes care of the players house in Megaton or Tenpenny Towers (depending on players choice of quests).

Purified Water can be given to Mickey outside Megaton or Carlos outside of Rivet City for positive Karma; this introduces the possibility of infinite Good Karma, as neither will ever stop asking for more water.