Drawngeon: Dungeons of Ink And Paper (EP)

You can find "Living water" in chests or buy it for 5 gold from the dealer that is found to the left when walking out of the starting area. You have to not have full health to be able to use it.

If you want to get this ASAP, start with the warrior and go into the first house in front of you and get hit by the spider, then go back outside. Turn right, go around the villager, then turn right, go over to the totem looking thing. Press 'LB' and select your sword, then press 'RB' to sell it and get some coins. Turn around and head straight a little and turn right to talk to the dealer, buy the "Living water from him. Then open your inventory, select it and press 'LT' to use it.

I'm not too sure what it does, it does damage you though. I think it replenishes your pages, which I believe the trickster or wizard uses. I've never used it except for this achievement and I've completed the game.