Wiggle Nutrition Energy Drink

£14.99 (1.5kg pack), wiggle.co.uk

For an affordable option, look no further than this tri-carbohydrate blend from online sports store Wiggle. Its fast-acting formula of dextrose, maltodextrin and fructose energy delivers 45g of carbohydrate per serving. Choose from Lemon & Lime, Berry and Orange flavours.