Any good ideas for plugging the bottom of a flower pot, too make it into a water garden container?

There's this stuff called Great Stuff at the hardware store that you spray into a space and then it expands and hardens.

Any good ideas for plugging the bottom of a flower pot, too make it into a water garden container?
for a permanent plug try plumbers putty. its available at most hardware or home improvement stores and works like epoxy
Reply:Silicon would be the best solution, but for a temporary fix try blue tac. Poster putty. I have a plugged pot and have put some fish in it. Looks pretty good.
Reply:go to hardware store and get a cork plug or a rubber stopper
Reply:silicon caulking
Reply:put something in the pot, like a piece of wood or something along those lines. its easy and cheap.