Homemade water filter (Black Berkey) Gravity fed- 100% filtration- will even take food coloring out of water!- dirty water goes in the top and filters to the bottom bucket where I have a tap. (buckets were 2.79 at Lowes). filters were $100 (I have since found filters much cheaper at www.InternetPrepper.com)- this will process lake water, rain water- pretty much anything I throw at it- good for 6,000 gallons. 
I made this myself after looking at all the expensive ones. I've been running this now for about 3 months. The water tastes better than Britta. The hardest part was the spigot, but I was able to cobble it together from parts at Lowes. (Internetprepper.com sells a kit with a spigot that works much better). I made a stand for it next to my washing machine.
I like that it's portable and it works great. I put a gallon of water in and take a gallon of water out.
