When you change the lava and water its tricky because when you change the lava its no problem, when your in the terrain file just change the lava to what ever you want just like a normal block but with the water you might want to use a shader tool or somthing of that sort because you still want to see through the water and see them white and black checkers behind the water! if you dont then you will have your water come out looking flat blue gooooop :( lol soo yeah thats how you do it!!! and if you use paint.net then just use the shader tool :) i havent checked out ant other picture editing software to check if they have a shader tool but if they dont i suggest switching to paint.net :) hope this helped SUBscribe

thanks man :D