Try entering values as close to your rocket as possible.
http://extension.osu.edu/rockets//cgi-bin/design_zone.cgi
Try the same numbers with and without water and note the difference.
Next try some numbers to see about adding weight to the nose.
NASA has a simulator that works well but requires some downloading:
http://exploration.grc.nasa.gov/education/rocket/BottleRocket/WRSimApplet/BRocket.html
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