Serving information: How much WhiteShield is needed in a cup of coffee is more a matter of strength than volume. As a rule, one packet of WhiteShield is effective for 8 to 14 ounces of mild to medium strength coffee. For stronger brews such as espresso or for larger cups of coffee, it may take two packets. WhiteShield dissolves in both hot and cold coffee, although you may have to stir (or shake, if bottled) the cold coffee more. WhiteShield is effective even when you do not have a stirrer—it will dissolve quickly even without stirring.