Best Water Purifiers

First time using Yahoo Answers, so I posted this twice in hopes someone would see it:

What water purifier should I buy? I need to buy a water purifier for use on camping trips (usually 1-2 weeks) in the Canadian Wilderness. The water is never polluted, but sometimes muddy/cloudy. Usually have 2 or 3 other people with me, so need to get about 10 litres a day. I’m looking for something I will have to buy only once, so money is not a consideration: 1.) What brand and model would you suggest? Please include details such as whether chemicals are needed / pros and cons / what kind of filter you’d suggest, etc…. 2.) Are Katadyn and PUR the same brand? Can you still find replacement stuff for PUR filters/purifiers? 3.) Do I need a purifier or just a filter to have safe drinking water in north Candian rivers, lakes where the only pollutants would be the occasional motor boat (such as Algonquin Park)? Thanks….I’m getting desperate for info!!!!

water purifier to purify from the creek water and making some Indian tea form the outdoors, PLAINS COREOPSIS is a Family Sunflower Family Native Americans made a hot beverage from plains coreopsis, , Survival way to purify water from creek”s,river’s,lake & pond, Wilderness Survival boiling water and adding Charcoal from the fire.(note you don’t need that much Charcoal in your tea or water like you have seen in this video 1/4 of the Charcoal will work)