to the forum jigger, and congrats on your new Bullet.
Keystone typically doesn't include a water filter system as a standard feature on most of their trailers/brands.
It isn't shown on the Bullet -
http://www.keystonerv.com/bullet/#/features
Just an FYI, for future reference... if there 'were' a full-house water filter system, it would be located somewhere
with easy access [to change the filter or winterize]. On our previous RV's they were under the kitchen/galley sink area.
Terri, the Chevy co-pilot