Making water terrain texture?

So I'm making a game that basically has a board made up of small terrain squares. I need one of them to resemble something like an ocean, or a body of water for that matter. I'm rather new to unity and was wondering how you can make a terrain texture/surface that simply looks like water? It doesn't need to have a depth. Most tutorials said that I need a shader that can create the effect, but the materials you attach to terrain seem to work different, so I don't really know where I should even start. Can someone please help?