Water Generator that you can put down and pick up with an attachable extendable Hose pipe of around 10-20 square blocks, so you can fill in holes that you made for creation/decoration purposes. Also it would have to have a "Limited amount of water usage", and would have to fill up overtime and "Fills up quicker on Planets with more Humidity", and can be Manually filled up with what ever substance collecting thing-e majig things there are. Like if you think this would be cool, because i think it would be good for Creation/Decoration purposes such as making a house surrounded by water, or filling in walls with water for a unique look Ect. Just an idea, maybe it's already been thrown out there or already exists within the game.
Nice, could also be used for irrigation, and combating fires, of course with an added pump // sprinkler system.