You could put the boat in after the ‘water” cures but to make it look like it’s in rather than on top, you can add acrylic gel around the hull and create small wakes. Alternatively, depending on how EZ water cures, you can put the boat in during that period where it still soft enough but will hold the shape of the hull. Then just take it out before it fully cures. You may still want to play with a little gel around the hull, however for the most realistic effect.
jerrman, Thanks for your ideas.