I made homemade ginger ale and root beer all the time. I actually bottle in glass. I call them Pirate bottles - they have the cork and the latch. I've never had any bottle bombs.
I use lemon because it creates a nice rounded flavor. I've also made a lemon/lime soda and it ferments much longer than the rootbeer. I usually ferment for 24 hours minimally. I have one bottle that I refer to as the "tester" so that I can pop it open and see how the carbonation is going. The home made brew ages nicely in the fridge and tastes better the long it sits.
I use ale yeast which I get at the beer supply store there is no yeast flavor afterwards and I don't get much yeast sludge in the bottoms of the bottles.
Mother Earth news has an edition where they made fruit sodas.
I like this guy's experimentations:
he also fermented some lemon ginger juice he gets from Trader Joe's.
I think there is a video on instructables where a lady made some strawberry lime soda? I can't remember exactly.
ETA: it was CRAFT not instructables:
Good luck and keep experimenting!