Quinine is the key ingredient, and the essential bitterness, in tonic water. The brand name Fever-Tree was chosen as it is the colloquial name for the cinchona tree, the bark of which produces quinine. After much research, a specific type of fever tree plantation (known as cinchona Ledgeriana) located on the Rwanda/Congo border, was found to be producing the purest quinine in the world. For Charles and Tim, there was no other option but to source Fever-Tree's quinine from this plantation - the only drinks company to be doing so. Read more about Tim's trip out to the Congo in the 'Latest' section.

Unlike most mixers and soft drinks on the market today which contain saccharine or aspartame, our products are sweetened with only natural sugars. In our regular products we use cane sugar and in our Naturally Light products we use fruit sugar. These natural sweeteners create a fuller mouth-feel with none of the cloying aftertastes associated with cheaper, artificial alternatives.

We use the very best quality natural spring water from a source in rural Staffordshire. With a low mineral content, this water is very soft, thus ensuring that our drinks are subtle in their taste and clean in their finish. High carbonation is a vital component of any mixed drink which is why we carbonate our products to an exceptionally high level. By using small, perfect bubbles we have been able to create an even smoother finish to our drinks. The smaller bubbles, combined with the viscosity created by using natural sugars, means that all of our drinks stay carbonated for longer - crucial when you are mixing them with spirits.

Bitter orange is another key ingredient in any tonic water and can be sourced from all over the world. However, we worked with a specialist ingredient hunter who told us about a rare and unique extract that he had discovered while in Tanzania. In a small town called Zygoma, bitter oranges are hand pressed under cold conditions which prevents the loss of the volatile fragrant components.