When sourcing flavored water, you must prioritize ingredient transparency and shelf stability. Ensure the product uses food-grade flavorings (natural or nature-identical) and verify the TDS (Total Dissolved Solids) levels to ensure water purity. If the product is marketed as 'sugar-free,' confirm the type of sweeteners used (e.g., Stevia, Erythritol, or Sucralose) and their concentration levels. Additionally, check the pH balance, especially for carbonated flavored water, to ensure it meets consumer safety and taste profiles.