Let the water sit uncovered for 24 to 48 hours
Boil the water for 15 to 20 minutes, then let it cool
Use a water conditioner designed to remove chlorine
Run the water through an activated carbon filter
Use a reverse osmosis system
Expose the water to sunlight in a clean, open container
Aerate the water with an air stone or by stirring vigorously
Use distilled or purified water instead of tap water