The sprite and similar bottles are made out of PET, you can read the threads on the virtue of PET vs Glass.
Personally I have some brown PET's I've bought. I've scavanged caps from other soda bottles (2L, 1L, 20 oz etc) and only had 1 bottle that the cap wasn't the right size/good fit. Since the bummer is a lambic, I'm saving the bottle for later brew use - it has a kersuan in the air gap.
Back to your question. You shouldn't have a problem. PET's are supposed to be good for 20 or so carbonations, caps I've read 5 reuses. I now after filling give the bottle a squeeze to see if it is a tight fit or I need another cap or to tighten it down.
This is a long way to say rinse out your soda bottles and use them if that is your <<$$ alternative. you can even use clear ones with the usual precautions of keeping them in the dark until you drink them. You could make 2Liter bottles for beer if you want, perhaps for a sharing event - I haven't I've got some 1L and .5L that I use.