It is very possible to ferment sugar water. Most brewers cringe when someone talks about it, but it really isn't all that bad. I've done it successfully numerous times.
1.Take 3.5 cups of sugar and add to an old milk jug
2.Take 12 cups of boiled water and add to the jug.
3.Boil 1 cup of water with a half of a multivitamin tablet (optional, though yeast doesn't live on sugar alone).
4.Allow both amounts of water to cool to about 110 degrees Fahrenheit.
5.Shake sugar water till sugar is dissolved.
6.Add one 1/4 ounce packet of active dry yeast to multivitamin water and wait for it to foam.
7.Mix yeast/vitamin water into sugar water.
8.Prick some holes in a balloon and put on top of jug opening (or use an airlock if you have it).
9.Wait about a week, or till the bubbles have almost totally stopped.
10.Sit in fridge until yeast sediment has settled to the bottom (usually about a day), then siphon liquid off the top. Be sure not to suck up the yeast.
11.Add two packets of your favorite Kool-Aid flavor, and enjoy!
What you have created is a Finnish drink known as Kilju. It doesn't keep well, so be sure to chill and drink within a week or two.