Question: how long are soda bibs good for?
Answer: The chemicals in the diet syrups will break down over time and will lose sweetness. Diets typically last about 9 months. If you drink soda on a regular basis this should be plenty of time, even if you get a 5 gallon box. As a soda drinker myself, I go through a 1 gallon box (with only me drinking it) every 4-5 weeks.