Simple Concrete

Simple Concrete adds an ability to instantly harden any concrete powder into its respective concrete block by just right-clicking a cauldron that is filled with water.

Simple Concrete's pros:

Unlike various datapacks that require you to toss the powder into the cauldron, with Simple Concrete you just need to right-click the cauldron. In my opinion, this feels more inline with vanilla cauldron interactions.
Due to the way Simple Concrete Registries are coded, this mod instantly supports any modded ConcretePowderBlock blocks (or any blocks that extend from ConcretePowderBlock), essentially making any modded concrete powder compatible with Simple Concrete. (for example, Dye Depot's concrete powders)