In the '40s and '50s, cyclists carried a metal container called a "bidon" to keep themselves hydrated during the Tour de France. One of the most popular bidons was the Coloral, a fluted bottle with a cork stopper that was said to not just carry water, but also a mix of milk and sugar to help maintain the energy levels of the riders.
Unfortunately, the Coloral ceased production the mid-1950's, but today is being brought back with a 14oz design that uses food-grade stainless steel with vacuum insulation to keep your drinks hot or cold and it's shaped to perfectly fit inside modern bottle cages. It also features a cork base and a stainless steel screw cap.
£35 (approx. $45), coloral.cc