In episode one, it's the mega brands versus the dupes. There are not many people on this planet who haven't heard of Coca-Cola. It's the biggest food and drink brand in the world, with the recipe of their famous signature drink a closely guarded secret. Surely a supermarket own brand can't concoct a drink that rivals or even beats the taste of Coca-Cola for a fraction of the price!! Or can it? We put seven dupe colas up against the might of the American giant.