Bottle carbing with soda is…interesting. Since you've got a lot more sugar than you do with beer you can get a lot more CO2.
When I bottle carbed a soda, I used PET bottles and waited until they were hard to the touch, then put them in the 'fridge. Glass can be used as well, but some people say you're more likely to get bottle bombs if you don't chill them once they're carbonated.
I had good luck with
this ChowHound rootbeer recipe, and I've used some recipes from
Homemade Root Beer, Soda & Pop
I also did a rhubarb-ginger soda that I think turned out well. It has the tanginess from the rhubarb and a nice ginger flavor.
Rhubarb-Ginger Soda
time 45 minutes
yield 1 gallon
ingredients
4 cups (about 2 pounds) chopped rhubarb
1 gallon water
Juice of one lemon
6 oz sugar
2 oz. ginger
directions
1. Put the rhubarb and water into a large pot set over high heat. Cover the pot and bring to a boil. Reduce the heat and simmer, covered, for about 20 minutes.
2. Pour the orange and lemon juices and honey into a 3-quart or larger container.
3. Pour the hot rhubarb through a strainer into the container, pressing on the rhubarb to release all the flavor. Discard the rhubarb.
4. Whisk to dissolve the honey in the warm liquid. Taste and add more honey if desired, keeping in mind that you will be diluting the base with seltzer.
5. Cool to room temperature and pitch yeast.
6. Leave in at room temperature until bottles are hard to the touch, then refrigerate.