heres a better way I used to make beer so I know a little about yeast.
take like about 2 to 4 lbs of corn sugar and mix into about a gallon of water and heat up on the stove for about 20 minutes. this process breaks the complex sugars down to a size that the yeast can eat all of it. then add to about 4 more gallons of cool water. after these mix you should have lukewarm water. too hot or too cold will kill the yeast when it is added. next add the yeast. next you need whats called an airlock. this will prevent oxidization from air getting in the mix. It is a top for the 5 or 10 gallon fermentation vessel with a rubber tube attatched and the other end of the tube goes into a pitcher of water. this method if done right will ferment for at least a week straight