Following the retirement of our soft drinks & water commentator, Annette Farr, at the end of last year, just-drinks has doubled up. Starting this month, we have two new columnists considering the state of the soft drinks & water categories. First up, Ray Rowlands from market research firm DrinksInfo takes a look at the opportunity afforded to low-calorie and no-calorie variants. However, the opportunity is marked by perils and pitfalls, Rowlands believes.