In fact, I wanted to create my own server with mods which would be in 1.12.2 in a way to have a lot of availables mods.
So that's why I wanted to know if there is a mod that integrates the aquatic update, etc ... and the differentes updates until the 1.15.2 version.
There is a few that come to mind from what I've reviewed/seen in the past.
Here is some videos/download links (not intended to plug, just to show what they can do before you download them if they aren't what your after) from those I remember (they may have been updated since I made the videos so it is likely they won't reflect the current state of those mods). There is probably others but these are what I remember at least.
They are also my older videos so the audio quality is not the best just a warning.
Conduit for 1.12.2:
1.13 Swimming in 1.12.2:
Sponges In The Nether As A 1.15 feature backported to 1.12.2: