How can I combine liquids by using blueprints?

Hello guys, I have a doubt about fluids.
In my game, I would like to create an object like water which we can separate and combine. For example, imagine you see a lake in front of you and the lake is special because the rain increase the water amount. I would like to create water as an object that we can pick up and drop it freely, like real water.
Thanks for you help.