Minecraft block broken by water?

Za
2

Is there a block in Minecraft that you can destroy with water but can be moved with a piston? Also one that you can get relatively easily in survival.

cl

That was once possible with the Nether Wart Block, but not for a long time.

Tr

One rail. But you can only move it if there's a block underneath. In addition, this is only possible in 1.16.