One of the most harmful habits most travelers develop is buying bottled water on a daily basis. Compounded over a week or two, one person can use a hundred bottles made from fossil fuels and most of them don’t get recycled.
The SteriPEN Traveler offers a painless way to purify any tap water so that it’s safe to drink. You simply turn it on, insert the pen into the water, and strong ultraviolet light kills any nasties that are lurking around. Buy the solar charging case version and you can use rechargeable batteries as well, powered back up by the sun.