Yes, I'm a little obsessed with clean water. I also don't like buying water bottles and with all the limited space, definitely something I felt I needed to get on top of.
The best option for taste and not quite so economical (ours was around 400 quid) is a reverse osmosis system installed under your kitchen sink. It filters water through a membrane using reverse osmosis and runs thru a series of cartridges which clean and add minerals back in. The is the cleanest water that can be made. There is a small tank that holds the filtered water and a separate lever on your tap to dispense. This requires basic plumbing skills (fitting a tap and connecting lines). We had our contractor install this for us but he said it is easy to install if you've ever installed a sink tap. The downside is you need to change out the cartridges every 6 mos (60 quid) and the membrane every year (40 quid) and you need to donate some under the sink space. The upside is the water is delicious and tastes better than most bottled water. I'm not comparing it with Fiji water but just common bottled water. The retailer we bought it from is called Osmio Water.
The other option is a counter filtration system. Those little jugs with charcoal filters like Brita are honestly a waste of money. They only filter out a few types of particles and don't really give you what you're looking for. The best system you can get this would be a gravity fed system like the Berkey light or Big Berkey. These will run you maybe $180 with filters and the filters last for 10 years. You can even add a fluoride removal filter for $40. The downside is it sits up on your counter (a little over 2 feet) and takes up about the diameter of a dinner plate. The cost is more affordable and you don't need plumbing skills. I've owned both and the water doesn't taste as good as in a reverse osmosis.
In summary, if you want something effective, you need to spend out a little and sacrifice a small amount of space.
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