It's a cocktail from your nightmares: diarrhea, giardiasis, fluorosis, adenovirus infection, amebiasis, cryptosporidiosis, and cholera. What do all these have in common? They are all diseases that dirty drinking water can give you. If you want to avoid them, you need to purify your drinking water. There are many methods that come in many shapes, sizes, and prices. Which one is best for you? This...