Hey! I am new to Unity and I can't figure out how to use this.

I made all the images into materials and using the animator I can get them to change but it's just black water. I can't get it to be transparent or show water under it.

Can you please help me? I don't know what I'm doing lol. I need 7 different water colors so I really don't want to make 7 sets of 16 materials.