The first thing you have to do when you start thinking about water filters is to determine what you need from the filter. How dirty is your water? Do you mainly need to filter out a lot of solid waste in the water or are there a lot of contamination and the danger of bacteria?
If you know that your water is from a relatively clean origin, a very simple water filter consisting of mainly sand and stones will be sufficient. If you have to worry about bacteria though, making a water filter with activated carbon will be a better idea.
The cheapest water filter, irrespective of your needs, will of course be a homemade water filter or a homemade water purifier. By making it at home, you know exactly what is in it. You know what kind of protection your family is getting.
So, looking at a homemade water purifier is not a bad idea. You can really make it quite easily and you will also use mostly ordinary household goods. By making a homemade water purifier you can protect your family the best possible way.
If you want to know more about homemade water purifiers, have a look at: