What's everyone's take on water purification? As far as drinking water goes. I have iodine tablets, are they good enough? Lifestraws? Sawyer's? Big pumps? UV lights? Bleach in a dropper bottle? Do you need something that takes chemicals out like charcoal or does a filter suffice? Also what's best for filling up bottles, I can't imagine a lifestraw would be helpful in that case.