Usually I purchase equipment for camping on Amazon, there are many kinds of water filters such as water filter straw, water filter bottle and water filter pump. For myself, I prefer to water filter straw which is light weight and easy to operate.
A camping water filter is for when you go camping but instead of having to take a whole bunch of water you already know is safe to drink, you can make any water you find naturally safe to drink by putting using your camping water filter. That way you can camp by a river or lake and drink that water and be sure to not get sick from some kind of contamination.
When you choose a water filter for outdoor sports, you should pay more attention to the removal rater of bacteria. There are a lot of malignant bacteria in water. Without filter, the water is not safe and healthy for drinking.
Outdoor water source such as streams or rivers often be contaminated with a whole host of bacteria, viruses and other pathogens, so it is necessary to carry a water filter for outdoor. Bottled water is also a good choice.
You can use water filter straw or water filter bottle to filter water which is quickly purify water and the water is safe and fresh to drink.
An MSR MiniWorks EX water filter can be purchased where at stores which sell products for camping and other outdoor activities. REI, Campmor, and Cabela's carry these types of water filters. In the United States, one might pay between $40 and $60 for one.
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Maxpedition sells a number of different types of camping and outdoor gear including backpacks, flashlights and water bottles. Their products are made to be strong and durable when outside or camping.
You can find water filters at REI and at Amazon. The prices range from $60 to $350 in both places. The Katadyn Base Camp Water Filter is priced at $69.99 which seems like a very well priced filter.
You can, but it prefer not to considering not everything will be filtered out.
If you're car camping then bring water from home. You'll save yourself a lot of hassle. If you're headed to the backcountry though, check out MSR's water purification options. They are top notch. I am not taking the MSR, I always take Diercon personal water filter when I go outside, it is more durable and portable. It could put into my pocket.
Katadyn manufactures individual water filtration systems. In the UK they can be purchased at outdoor stores specializing in camping and backpacking equipment. They can also be bought online at Amazon.
In general osmosis water filter can be found in most outdoor and tracking store. Besides that also online stores like Amazon have different models in stock.