Water

Water doesn't flow, but it fills a space if you break a block next to water.

Water mechanics are planned, and they will be very similar to the water mechanics in Minecraft. This means that there will be a distinction between a water source block and flowing water block. It will be possible to create more water source blocks out of other source blocks; but most of the time, water will spread in the flowing state. While flowing, water will create persistent waterfalls and "rivers"; however, it will require a water source at the start. As soon as that source is removed, water will drain.