Chill water thoroughly
Fill a clean bottle or soda maker with cold water
Add carbonation using a soda maker or CO2 charger
Shake gently if using a carbonation bottle
Add flavored syrup, fruit juice, or simple syrup
Stir or cap and invert gently to mix
Taste and adjust sweetness or flavor
Serve over ice if desired
Store any leftover soda in the refrigerator
Use a tightly sealed container to keep carbonation longer