Just a simple mod file I made that applies Heretic style liquid physics to all the liquid floor tiles in DOOM/DOOM2. I also included support for the extra liquid tile in the current version of Freedoom (SWATER1-4) as well as the liquid tiles in Eviternity.
Its simple and to the point. Just include it in your mod load list and you're good to go. Should be compatible with almost any other DOOM mod. Obviously it won't add liquid effects to custom liquid tiles (unless they overwrite the default tiles).
The splash sprites are in DOOM lmp style art format, so they will automatically conform to custom palettes.
Preview video:
The file:
Sprites and SFX taken from Heretic and Hexen.
EDIT: Just in case the topic comes up if anyone wishes to expand on this mod by adding support for other mods with custom liquid textures go right ahead. I don't mind treating it as a public domain project. Just don't remove any existing content.