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TOP TIP: Flower Pot Drain Hole Cover: Just lay a coffee filter in the bottom of the pot covering the hole before filling the pot. The soil will stay in the pot and the water will still drain out because that is what coffee filters are designed to do; let water through. They last for a long time, too; by the time they fall apart, the potting soil is well packed and the plant has roots that hold the soil together.
I really like this idea for my indoor plants! Every time I water them in the sink, I lose a lot of the soil down the drain, not to mention the mess it makes under the pot. Coffee filters allow the water to still drain, but keep the dirt contained.