I'll be honest, I don't know much about this. I know most of you reading this probably think this is a weird/dumb question. What I've read so far is that Electromagnetic vibrations travel strongly through the vacum of space, yet Water acts like a damper. Vibrations in water are considered Mechanical vibrations. What I want to know is there any way scientifically to enhance the strength of Electromagnetic waves in water. Even if there's an odd theoretical scenario where this is possible. Any help would be appreciated. 

It (the "damping" effect; ie. absorption) depends on the frequency. Water has little effect on many frequencies (it is transparent, for example, so has little effect on light). But it will strongly absorb some radio frequencies (this is why microwave ovens work).

You mention mechanical vibration - that has nothing to do with electromagnetic radiation except when it is absorbed and heats the water. 

"Enhancing", as in amplification, requires an amplifier of some sort. And that requires an energy source.