Taut is a sports drink with no added sweeteners or chemicals. The site has more info. Its especially good for people who either try, or need, to avoid certain chemicals in their diet. It doesnt contain aspartame unlike the majority of sports drinks, and tastes lovely!
Anyways, coupon is redeemable at waitrose, tesco, and certain garages. (think there are a few more shops too, have a brain fade day sorry...)
redeemable to the price of £1.39 and its for all drinks within the taut range