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What is that attatchment called that you can put at the end of the camera that supposedly blocks/filters unwanted light?
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Unwanted as in for reducing the amount of light reaching the sensor/film plane, or as in reflections on water/glass?
For simply reducing the amount of light, you use a neutral density filter. These come in various densities and will take 1, 2, 4, 8, etc. stops of light, depending on how much light you want to keep out.
For removing reflections on water, darkening skies, etc. you use a polarizer, which you turn until the desired effect is achieved. A good circular polarizer is approximately $2/mm diameter, so for a lens that takes 77mm filters you're spending around $154 USD.