ND filter for water shots?

For your first kit I would recommend the Cokin P system. fairly cheap and a wide range of filters. You buy a holder and an adapter for your thread sizes and then add the filters as needed..

However I have a screw on Crircular Polariser, not a drop in. I have also bough the 85mm Hightech 10stop filter, White balance adjustments will be needed due to the magenta colour casts..
 
ND filters comes in 2-4-8 or 10, (2 being the weakest) I use the circular ones, so thats my recomendation, and yes, you can compose with these filters in place.
 
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