Making water from scratch

That’s the problem I’ve had. I don’t really want to use a texture made outside of the engine for water.
I’m pretty sure there’s a way to get the Noise to look good enough for waves (Especially if it’s for far oceans and suchs) I’m only trying to make a small Low-Poly project right now, but I still want to have water look somewhat like water (I could make a 16x16 tri’s plane, but it wouldn’t look right.)