Give this recipe a try:
http://www.jeffreymorgenthaler.com/2008/how-to-make-your-own-ginger-beer/
1 ounce ginger juice
2 ounces fresh lemon juice, finely strained
3 ounces simple syrup
10 ounces warm water (cold if using the soda siphon)
I've made a ton of this stuff and my whole...