So how did I add water to the game, it was actually quite difficult as the terrain is easy to shape but adding something like liquid is harder as it can spill, overflow and so on, so what I first did was
I created a heightmap from the coarse noise map from which I searched spots where a single water could be placed without spilling, after I had done that I made a sort of a filling algorithm that would raise water to nearby neighbors until a x number of nodes were found, then I remove all nodes that have neighbors (except ones that have been found) that are lower in height than the highest node that was found, now I had possible lakes that could be formed but there was another step I had to do.
Left has water locations, middle one lakes and right is the heightmap.
Next up I created a heightmap from the finer noise map, now that I had all the lakes from previously, I go through all of the lakes and find the lowest point of each lake and I locate them in the finer noise map from which again use a filling algorithm, this algorithm is essentially a better version that I used to find the lakes. The result does not fully represent the lake that was found from the coarse map as the finer noise is modified slightly to add slight differences to the terrain.
Below is a gif of a lake, not the same one as in the heightmap.
