How do I make a puddle depth map

I came across this video and he talks about how he made water ripples by sculpting a puddle texture and made that into a depth map. I thought it was really cool. since I don’t how to sculpt anything how would I go about making still water ripples in my scene without using dynamic paint? or is there a sculpting brush that does water ripples that makes the process easier or is there a website where I can find depth/hight maps of water ripples?

Try this tutorial: