Hi Andrew,
Thanks a lot for your detailed reply! I was aware that I could just place post process volumes into the scene, however my intention with adding them to a “water” blueprint would be so that it would be nested with all the elements of water, ie. a water surface plane, code for telling the player to swim, code for slowing down projectiles. Adding the post process volumes to the scene separately would mean having to place two elements into the scene wherever I wanted water.
Does this make sense?