Look at the article in Nov 2004 issue of FSM called "Making Waves". It's a technique, very inexpensive and very forgiving, to make water, using a base of aluminum foil (to make a wavy water surface, painted to look like water) with a heavy overcoat of ModPodge (which looks like the clear water). ModPodge is a decopage liquid that looks like thin white glue, but dries thick and clear, giving a nice waterlike appearance. I used this technique on an HO scale layout, and it looks great...and it is cheap and easy!