Leery of foreign tap water? Here’s a simple solution that you’ve probably never heard of. It’s a portable filter that slides onto your water bottle and turns questionable water into pure, clean drinking water. You screw it on in place of a traditional bottle lid and it sucks out the impurities before they reach your lips. The filter can be reused up to 90 times and (bonus!) it comes attached to a biodegradable water bottle made out of (who knew?) corn. Bring one along for each family member. Just remember to pack some soap suds to clean them out each day. ($8.75 at Whole Foods)