Unfortunately it's not possible to change muddy water to blue water. I get asked this all the time.
You see, if water was blue, it would have to be clear. And if it was clear, you'd be able to see (a) through it to the bed to a degree, and (b) more reflections.
If you change brown to blue, it doesn't look like clear, nice water, it looks like nuclear waste.
Sorry to be the bearer of bad news