I'm using Cycles.
I've been messing around, trying to have fun with Minecraft Blocks in Blender. I also made water, using just a square - one face of a cube. I tried mixing transparent with diffuse BSDF, everything looks really cool, but I would like to have some refraction cause the shadows look unnatural.
I'll attach a photo so you know what I mean.
I don't know what to do. When I use Glass BSDF it looks like it's almost black.