Elderbrook Cordial Tonics is a London-based subscription box that features homemade cordial tonics enriched with superfoods. Cordial tonics are a new way to make water tastier whilst doing yourself some good. They blend fruit, superfoods and add some natural sweetness using coconut nectar. It’s low GI and full of goodness like amino acids, vitamin C and calcium. Each bottle makes approximately ten 250ml drinks.