I've never bottled the root beer, but it makes sense that it will stay carbonated. The carbon dioxide would have no where to go... so i think it would stay fizzy. Let me know if you try it.
Yes, exactly. Dry ice is nothing more than frozen carbon dioxide. When it sublimates ("melts") it turns in to CO2 gas. This is what will carbonate the rootbeer. You need to cover it to keep the carbon dioxide in.
After it is done you should be able to bottle it without any problems. The...
Zwetschgen,
It is definitely not a bad idea. I've done it tons of time. I posted the recipe on my website if you want to check it out. It will tell you just how much dry ice you need and how to make it. Enjoy!
http://dryicenetwork.com/dry-ice-food/dry-ice-root-beer/
The site that is all about dry ice was talking about using dry ice to cool a refrigerator (like when your power is out). It says that all your drinks will be carbonated afterwords... milk, water, anything open.
Dry ice can be dangerous if ingested. I was reading a website on dry ice and it recommends against that. Could you imagine if you drank dry ice. I was just reading an article about an MA kid that did it. What are the advantages to keeping drinks cold with dry ice?