Fever-Tree is a brand known for producing premium mixers, particularly tonic water. Founded in 2003 by Charles Rolls and Tim Warrillow, the company focuses on using high-quality ingredients to create beverages that enhance the flavor of spirits, especially gin. Fever-Tree's products are available in various flavors, including Mediterranean and elderflower tonic waters. The brand has gained popularity worldwide and is often found in bars and restaurants. Fever-Tree emphasizes its commitment to natural ingredients, avoiding artificial flavors and sweeteners. This dedication to quality has helped the brand become a leader in the mixer market, appealing to both casual drinkers and cocktail enthusiasts.