RE: What Type of Filter do I Need?
A Polarizer will help but a neutral density filter will work best. The Polarizer's gonna saturate your colors and take some of the glare off of the water which will take a couple stops off of it but a 2 stop ND (0.6)is a good medium filter for these types of shots. You may also want to look into a graduated ND filter in like a Cokin system so that you don't lose the detail in the foreground.
This is assuming you're shooting SLR. They still make ND and Polarizers for some P&Ss but I don't recall Conkin having any systems for them.
EDIT: Here in the attached you can see the forground is still the same exposure as the sky, not possible w/out filters or hours of photoshop work.
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