Water bottles are fundamental items for your bike, fluid replenishment is essential for long term activities and fitting a water bottle and cage to your bike is the perfect way of keeping you hydrated. Studies show that loss of fluid equal to 2% of your body mass is sufficient to cause a significant decrease in performance. Most Bottle cages will accept water bottles from 500ml up to 1,000ml, making it possible to carry 2,000ml of fluid on your bike. It's also worth using an Energy drink whilst riding as these will help replace minerals lost through sweating and Hydration Packs as these will allow you to carry greater amounts of fluid.