Look for a pre-formed pond liner at least half again the diameter of the largest fountain basin. Dig a hole in the ground so that the lip of the liner is even with the soil surface. A metal grid over the top of the liner will support the fountain, but if particularly heavy, you may need concrete blocks or bricks in the base of the liner to provide additional support. You can disguise the grid and liner by covering with decorative rock. These reservoirs look best with a very naturalistic or simple water source - not exactly the right style for a more formal statuary fountain - but it should work fine.

And please accept my sympathies for the disruption and destruction Rita inflicted on you. So far away from hurricanes and tornadoes and the like, it's hard to imagine what you all must be going through.