Is it possible to change the color of the water? If so, can someone tell me how? I'm planning on making a map that's just a dead planet that used to have a large population so there's a large river of blood on it.

in ze click the water tab and about 1/2 an in from the bottom on the menu on the left is a set of 3 boxes with the word color above them..... first box is red second is green and third is blue.... u vary the #s to get different colors....