Hard Water

This variant of water can be created by combining a Bucket of Water and Gravel, the recipe gives you a Bucket of Hard Water. This liquid pours slower than regular water and slows motion of any entity through it. You can also collect it with bottles, while the bottles can't be used in brewery, drinking a bottle of Hard Water does give you half a bar of Saturation.
Hard water blocks and regular water blocks won't mix with each other, they'll float on each other. While placing 2 diagonal blocks of water creates an infinite source, Hard water does not.