Minecraft wiki entry for Superflat_survival, associated text: A zombie with its head underwater for 30 seconds converts to a drowned. You need to kill drowned mobs for their ores. In Java 1.16, drowned can drop gold ingots. In Java 1.17 and above, drowned don't drop gold ingots. Instead they drop copper ingots. Collect 3 copper ingots and craft a lightning rod. With the power to direct lightning, you need a pig farm and a carrot/potato farm.