A lot of people seem confused about how to obtain Mud and its various derivatives. To help with that, I made this guide for the processing chains related to Mud and mud byproducts.
Part 1: Obtaining Mud Water
Let's start off with the Seafloor Pump. It outputs Viscous Mud Water at a rate of 300/s, and - like the normal Offshore Pump - it does not require power. There is another way of obtaining Viscous Mud Water, but it requires starting out with some to begin with.