>>That is something we do as well, although what I typically do is buy a full box of Spring bottled water bottles and then wash and refill those bottles from home as they are used. It is a pain to keep washing and drying them, but worth the savings and the convenience of having bottles to carry water around in. They fit great inside of small coolers (for driving and walking around etc). We do this for 3-4 months and then buy a new box of them.
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>AIUI, those bottles are not designed for re-use. Perhaps washing and drying in between makes it safe, but I don't know.

Re-use? Why would they be different than a plastic glass?