A Way to Break Down and Place Environment Blocks OR change how water works

I've been playing for awhile and, due to how the seeding worked I guess, my Azeos Wilderness is now full of starry water from The Shimmer Expanse. I'd really like to fix this and am in the process of slowly changing it back over to normal water. However, right now, I have to place blocks to get rid of the water in sections, then clear them again for the right type of water to seep in. If there is a way I could either 1) place more blocks and remove more blocks at once to improve speed in this endeavor or 2) a way to change how the water works (just transferring the Azeo's water to the starry water doesn't clear it, the Starry water is "stronger" so it immediately takes over the Azeo's water), it would be much appreciated!