How do I make Minecraft like water

Hi there, I have always wanted to make a Minecraft 2D game and I have made some with Gamemaker but since switching to construct 3. I would like to make a good one. I have never been able to make water work and I know the basic logic to do so just not the ability to code it. I want the water block to see if there is a empty space next to it and if so create another water block next to it in the empty space. I did some quick Messing around before construct crashed and it worked to make the water block if there was an empty space next to it but unfortunately it would just keep making water block even if it sensed a non water block was next to it. I was using the if overlapping offset condition to check if place was free and then using an instance var to keep it if the offset detected a non water block. I will definitely mess more with it soon but just wondering if anyone knows how to do this. Note I’m not looking for a physic behavior simply just to check if either side of the block is free and if so then create a water block next to it