Minecraft wiki entry for Drowned_farming, associated text: To construct a survival-mode drowned farm, you need a conveniently located dungeon with a zombie monster spawner, as well as a good weapon to clear out the dungeon, a cheap weapon to harvest drowned, torches, pickaxes, a water bucket, and a few signs. Optionally, glass blocks are helpful for viewing when a zombie becomes drowned. Hoppers and a couple of chests also aid collection but are not necessary.