Berkey. The filter removes viruses, bacteria, parasites, heavy metals, chlorine, fertilizers, and VOC's. It cost us less than $300 and the filters are good for around 16 years average for our family use. When you do need to replace them they are only about $40. Bottled water was costing us about $1.10 a day x 365 days per year = $400. Paid for in less than one year. Not to mention the 365 water jugs kept from the landfill.
I know that we can't collect rain water in the dead of winter. We could melt snow if we wanted to but that could turn into a huge pain. So during the winter we will be using tap water. We bought a couple of fluoride filters ($30) so that we could still have good fluoride free water all winter.
The water is delicious by the way.