What's the proper way to disinfect water so it's safe to drink?

The preferred method of treatment is boiling. Boiling water kills harmful bacteria and parasites. Bring water to a full ROLLING boil for at least 1 minute to kill most infectious organisms. If boiling water is not possible (power outages) potentially contaminated water may be treated with chlorine or iodine tablets. However, this treatment will not kill parasitic organisms. To disinfect with chlorine mix six drops (1/8 teaspoon) of unscented, ordinary household chlorine bleach (5.25% sodium hypochlorite) per gallon of water. Mix the solution thoroughly, and let stand for about thirty minutes. To disinfect using iodine put eight drops of 2% tincture of iodine in one quart of water. Allow the water to stand at least 30 minutes before it is used.

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1. Is my well water safe to drink?
2. What about water from a public water company?
3. What's the proper way to disinfect water so it's safe to drink?
4. What infectious organisms might be present in contaminated water?
5. What if I've already consumed potentially contaminated water?
6. In what other activities should I avoid using potentially contaminated water?
7. Is potentially contaminated water safe for washing dishes or clothes?
8. Is potentially contaminated water safe for bathing and shaving?
9. How should I wash my hands during a boil water advisory period?
10. Do I need any vaccinations if I have been exposed to flood water?
11. Is it safe for me to participate in the cleanup (basements, offices, etc.)?