I spent a few years in the US Army (Infantry, Special Forces). We used iodine tablets extensively, sometimes for up to 6 weeks at a time. Sometimes if the water was really nasty up to four tablets per quart. Presweetened Kool-aid helps this allot. I never had adverse affects and I never heard of anyone else having a problem. Do keep the tablets capped up as they will break down over time if left exposed.
During trips to Africa, our medics purified the common water with clorine. I dont know the dosage, but you could taste it in the water. A couple of drops per gallon I think.
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