Batch a drink
Measure concentrate, water and ice separately when melting or dilution changes the recipe.
Labels
Two drink labels are comparable only when the serving basis and units match.
In practice
A small bottle and a larger carton may show similar numbers per serving while containing different numbers of servings. Write both the stated serving volume and the whole-container volume before comparing.
Read the ingredient list separately from the nutrition panel; neither is a complete personal health assessment.