If you plan on backpacking into a campsite you'll need to carry your water with you.  If you carry enough water with you to last the length of time you'll be on your adventure, you won't be able to carry other items you may need.  A solution to this problem is to have a camping water filter.  A portable water filter will provide you with clean water as long as you have a source of water.  If you're not prepared when you're in the wilderness, you may be forced to drink water from a stream or river.  If that water is not clean, you may get major stomach problems, diarrhea, and sickness.  If this occurs you may find yourself in a desperate situation.

Searching the internet is a good way to see what's available, how they work, and what other people are saying about it.  This will help you determine the best brands and what the range of prices is.  Look for ones that are small enough to carry in your backpack.

Make sure the portable filter you're planning on buying is easy to clean and replacement filters are readily available.  Do your homework by reading reviews to find the water filter that will meet your needs.  You don't want to find yourself out in the boonies with a water filter that's not equipped to handle the type of water you're trying to purify.

It's important to have the right equipment when you're camping, so do your research before buying.  If you have a local camping store where you can rent equipment, it may be best to try a couple water filters out before buying.  Staying hydrated when you're hiking and camping is so important.  You'll be able to cover a lot more distance and feel much better if you're drinking water on a regular basis than if you're trying to conserve the water you're carrying.  If you become dehydrated you're much more susceptible to heat stroke and accidents from being sluggish both mentally and physically.  If you're prepared, your camping experience will be much more enjoyable.