Gulf Stream doesn't seem to provide owner manuals for individual models, a frustration for many of us. You can, however, get manuals from their website and elsewhere for the various appliances etc that were included in your RV.
If it helps, this is a photo of the water connections for my 2005 BT Cruiser. The water tank fill is on the left and the water hookup is on the right. (The white cap at lower right is for the water tank fill.) I understand that these aren't always located in the same compartment.