need a little help with a blueprint script please

so i know its easy and simple to place a physics volume to act as water in your scene but what im trying to do is place an object that also has a physics volume that acts as water and i can add a physics volume through the component menu of the object by adding an actor but i cannot make the volume act as water this is where im stumped so i figured it would need to be done via the blueprint graph of the object but not sure on how going about it…and im not interested in adding the post process effects like how it looks blue under water i just need the water to be swimmable when you enter it like regular water if that makes since

can anyone help me with this please or atleast nudge me in the right direction