Find clay blocks underwater in rivers, lakes, swamps, beaches, and ocean floors
Mine clay blocks with any tool or by hand to get clay balls
Use a shovel to break clay blocks faster
Smelt clay balls into bricks if needed
Trade with a mason villager for clay
Dig up suspicious sand or gravel in some structures if you need related materials
Use commands in Creative mode: `/give @p clay` or `/give @p minecraft:clay`
Use a Silk Touch tool to collect the clay block itself in Java Edition