I show you where to find the Water Filtration Machine Blueprint Fragments in this quick video. The location has changed in the recent 2017 update. It’s about 320m southwest of the lifepod and then 260m down.
I take you from the starting lifepod to the Jellyshroom caves and down to a base which contains a Water Filtration Machine which you scan to get the blueprint. You’ll want to bring the Seamoth becuase you need to go down more than 200m. You will also want the repulsion cannon so you can move some drooping stingers. You may also want an air tank, seaglide and rebreather to let you stay down longer.