Rita that truly is a gorgeous pot. Don't blame you at all for not wanting to drill a hole in it. You probably don't want it outdoors in the winter either.
Maybe you could use the very tough coconut coir liners? Would easily lift out when you wanted to remove excess water in the pot?
Here are some more photos of things that might be used.
You could even go to the Dollar Store and get one of their plastic or coated wire baskets that would fit into your container, line it with coir and add soil.
I'm sure we have others here that would have some really great ideas.
Really love that bowl.