For those of you into prepping, or living in flood/disaster prone areas, I found something really, REALLY neat and practical.
It's called the My Patriot Supply LifeStraw:
This little filter claims to allow you to drink water safely from contaminated water sources. I think this would be dandy in emergencies like local flooding which can contaminate drinking water supplies. Best of all, It's under $25!
Campers & hikers would probably find it useful too, since they might be drinking from rivers or lakes and are unsure of the water safety. It's lightweight and compact (only 2 oz.), which makes it easy to throw into a bag and take it on the go.
Here's what the manufacturer says it filters & Key benefits:
Perfect size for your "Go Bag"
Filters 264 gallons of water
Removes 99.99999% of waterborne bacteria (>LOG 7 reduction)
Removes 99.9% of waterborne protozoan parasites (>LOG 3 reduction)
Reduces turbidity, filtering down to 0.2 microns
Ultra light: weighs only 2oz!
Contains no chemicals (and is BPA-free), uses no batteries, has no moving parts
Very high flow rate
Easy to clean
Used worldwide in harsh conditions since 2005
Award winning & internationally recognized
1 year manufacturer's warranty
Here's the link to get one. I really think this is cheap insurance for you and your family, especially if you're concerned about water quality: