There is no one definitive answer to this question as it depends on a variety of individual factors. However, as a general rule of thumb, it is generally recommended that people drink no more than 2-3 glasses of sprite (or any other carbonated beverage) per day when taking codeine. This is to help prevent potential gastrointestinal issues such as bloating and gas. Additionally, it is important to stay hydrated when taking codeine, so drinking plenty of fluids throughout the day is also advised.