What is the best water filtration device?

I had a PUR filter on my sink for about a year before it started falling apart and spewing water everywhere, tried the Brita pitcher and that also started leaking near the spout a month after I purchased. Im tired of spending money on these crappy products. I would buy a filter for the entire house but we rent. Whats the ultimate in home water solution that is fail proof? All I drink is water so I need something that works.