Best cure for cold and flu?

I had gone with my friends for swimming in the river but what they did not know was that that i did not know how to swim,but then i did not want to reveal the fact that i did not know how to swim ,so i happily went along with them.And then after having a slight swim in the river water i caught cold and flu and i am still on bed rest .since my second semester is starting from the next week i need to know that what is the best and the fastest cure for cold and flu?