I have worked with a tripod.
The distance to the objekt wasn't so close as you suppose. I used a 18-135 mm lens.
My camera was switched to on manual focus and I worked with a quite small aperture.
It was very difficult to manage the right display detail and the sharpness but in the end I was able to take this picture.
But as I wrote before it took me a long time of hard work
The blue water I made with CS3 from a RAW.