What type of water should I use to mix my formula with?

The Canadian Paediatric Society, Health Canada and Dietitians of Canada state that unsoftened tap water, well water meeting established standards of safety, and commercially bottled non-carbonated water (natural spring water drawn from underground springs, and treated water with low mineral content), are suitable for infants.
If your baby is younger than 4 months, Health Canada recommends boiling the water for use in mixing formula for 2 minutes.