Score dwarf waterlily seeds. Other varieties will outgrow a bowl. The outer husk of the seed is deep black. Rub them with a file until you see the creme within.
Fill a clean, 2-liter bottle with warm water. Add the seeds.
Place the bottle someplace you often visit, such as the bathroom or kitchen. Gently shake the bottle whenever you're in the room.
Change the water daily. Within two weeks, the seeds will sprout. Once they're three inches long, they're ready for transplant.
Select a wide, shallow bowl. Waterlily roots grow horizontally. They don't need deep soil, but they do need room to grow to the side.
Line the bottom of your bowl with 2 inches of heavy gardening clay. Do not use clay with fertilizers added.
Plant the waterlily in the soil, one waterlily per bowl.
Layer the top of the clay with pea gravel. This will hold the soil in place.
Check the water regularly. If it gets cloudy, replace it with fresh water.